It is important when we examine the writings of the Zodiac Killer to view them in context to the news breaking during the time in which he put pen to paper. The 1970s were a turbulent period in San Francisco and the Zodiac certainly monopolized on this fact in at least three of his communications pertinent to this story. The Zodiac Killer also had a penchant for adding historical references to his material in order to convey the message. The Mikado by Gilbert & Sullivan, a Tim Holt comic book, The Most Dangerous Game by Richard Connell, and surprisingly, Moby Dick by Herman Melville to name but a few. To believe the Zodiac Killer's bomb threats may have been inspired by a man who borrowed the Moby Dick author's name, may take a bit of selling.
Samuel Joseph Melville was the principal conspirator and bomb setter in the 1969 bombings of eight government and commercial office buildings in New York City. He was born Samuel Joseph Grossman, but changed his name with respect to novelist and poet Herman Melville.
​He had already committed four bombings prior to the November 9th 1969 Zodiac 'Bus Bomb' letter. It began with Grace Pier on July 27th, followed by August 20: Marine Midland Building, September 19: Federal Plaza and then an Army Induction Center on October 7th. These crimes received statewide coverage throughout America, but were they an inspiration to the Zodiac Killer in the power of large scale destruction as a tool for terror. The answer may have come five and a half months later.
But first we shall take a look at the April 20th 1970 letter, which stated
"I am mildly cerous as to how much money you have on my head now.  I hope you do not think that I was the one who wiped out that blue meannie with a bomb at the cop station.  Even though I talked about killing school children with one. It just wouldn't doo to move in on someone else's teritory.  But there is more glory in killing a cop than a cid because a cop can shoot back.  I have killed ten people to date. It would have been a lot more except that my bus bomb was a dud.  I was swamped out by the rain we had a while back."  
We know that the Zodiac Killer often referenced newspaper headlines - and this communication would be no different - denying his involvement in the murder of San Francisco police officer Brian McDonnell (44) on February 16th 1970. Person or persons unknown had placed a pipe bomb packed with fence staples on the window ledge of Park Police Station in Upper Haight (1899 Waller Street). Another eight police officers were injured. The Zodiac Killer was unlikely to have had any involvement in the bombing, however, he was keen to suggest that he was capable of such an act, but for "the rain we had a while back."
Two weeks prior to the April 20th 1970 Zodiac letter, on April 6th 1970, the deadliest day in the history of California law enforcement occurred, when two armed criminals managed to kill four California Highway Patrol officers in just under 5 minutes. Known as the Newhall Massacre, it hit the newspaper stands around the country.
One can't help thinking the Zodiac Killer was fully aware of this tragedy, when he cynically penned the words "there is more glory in killing a cop than a cid because a cop can shoot back."  Or maybe, we give the Zodiac too much credit.
The Zodiac Killer may not have killed Sgt. Brian McDonnell on February 16th 1970, but his following correspondence on April 28th 1970, just eight days later, would certainly coalesce both Sam Melville and Park Police Station under one banner, when he wrote "If you dont want me to have this blast you must do two things. Tell everyone about the bus bomb with all the details. I would like to see some nice Zodiac buttons wandering about town. Everyone else has these buttons like, black power, melvin eats bluber, etc. Well it would cheer me up considerably if I saw a lot of people wearing my buton. Please no nasty ones like melvin's. Thank you."  

The phrase "melvin eats bluber" was referring to the prominent lawyer and bon vivant Melvin Belli, who had earlier become the focus of one of Zodiac's letters. The Zodiac was referring to the 1960s fad buttons created by Irwin Weisfeld, but had altered the slogan from "Melville Eats Blubber" (Moby Dick) to "Melvin Eats Bluber".
Bearing in mind the introduction and tone of this card: "I hope you enjoy yourselves when I have my blast," and his choice of counterculture button, the following connection cannot be ignored.
​The Zodiac borrowed the Melville Eats Blubber button and changed it for purpose, as did Sam Melville, when altering his name from Grossman to Melville before his bombing campaign. The crucial question, however, is where did Zodiac intend to have this "blast". The clue may be staring us square in the face (see image on right).
The Zodiac Killer wrote "I hope you enjoy yourselves when I have my blast" around the picture of Don Quixote and Sancho Panza, the characters in a novel by Miguel de Cervantes Saavedra.
These characters are situated only 3,650 feet (0.68 miles) from the murder site of Sgt. Brian McDonnell, both of which are situated in Golden Gate Park. 
The Zodiac Killer, almost certainly, never had any intention of placing a bomb near the Don Quixote and Sancho Panza statue in Golden Gate Park, but the fact that this statue was in such close proximity to the bombing of Park Police Station on February 16th 1970, could be interpreted as a mischievous and insensitive offering to police. He was effectively rubbing their "noze in their booboos."
Then came the possible threat on Ingleside Police Station, two months later, on June 26th 1970, contained within the 'Button' letter and map code, and featured in the article 'The 32 Symbol Code-Hidden In Plain Sight'. The Zodiac Killer would again reference the slaying of another police officer - on this occasion Sgt Richard P. Radetich (25), who on June 19th at 5.25 am was gunned down by three shots from a .38 caliber revolver at point blank range through the driver side window of his vehicle, while in the process of serving a parking ticket. He was sat in his police car near 643 Waller Street, The same Waller Street as Park Police Station. 
The proximity of these three consecutive communications to the area of San Francisco shown below, certainly shows us where the Zodiac Killer's focus was between April 20th and June 26th 1970. However, he wasn't finished just yet. The 'Little List' letter mailed on July 26th 1970 was the fourth and final piece of the jigsaw.

The Zodiac Killer gave us a map code on June 26th 1970, stating the "map coupled with this code will tell you where the bomb is set." To this day no bomb has been unearthed and the threat was likely an idle one, designed primarily to create fear within the American community. However, the map and code were real, and the answer to both has probably been sitting in plain sight for nearly fifty years. The Zodiac, aware that the '32 Symbol' cipher was unable to be broken because it had 29 different characters, gave us all the answers one month later when he mailed the July 26th 1970 'Little List' letter.
The numerous suggested bomb threats were all mailed to the San Francisco Chronicle, so it was evident that his threats were focused on San Francisco itself - which is why the Mount Diablo map included San Francisco and Vicinity rather than just the area around Mount Diablo. The 'Little List' letter was replete with all the information required to crack his map code.
In the 'Button Map and Code' letter the author gave us the "map coupled with this code will tell you where the bomb is set," and just one month later, clearly told us that the code "concerns Radians & # inches along the radians" Therefore, the code will at least contain the words "radians" and "inches" in the answer - and that may very well be the case. In fact, it tells us exactly where the intended bomb was to be set, within the design of the crosshairs with the bold black circle. With the threats geared towards schoolchildren and police it is apparent that these are the likely targets. The reference to SFPD = 0 being incorporated within the crosshairs, along with an accentuated black, bold zero suggesting a location, should be the biggest clue of all. His intended target was the San Francisco Police Department - the location of which can be found within this bold circle. 
The Zodiac Killer referenced "radians" and "inches" (not parts of radians and inches), so with probably just the use of a ruler back in 1970 the Zodiac Killer would measure his intended target this way. Therefore, if he is one eighth of an inch off in his measurements we can forgive him this textual indiscretion. Fortunately, we have Google maps, so the task is much easier.
With an intended target in San Francisco, there is only one answer possible to the "radians" and "inches" conundrum, and it's governed by geography. 1 radian = 57.3 degrees, 2 radians = 114.6 degrees, 3 radians = 171.9 degrees, 4 radians = 229.2 degrees and 5 radians = 286.5 degrees. This is detailed crudely on the map below.
It is apparent that Zodiac wasn't referring to 5 radians, as a line subtended from Mount Diablo at this angle would pass north of San Francisco. The same applies to 3 radians which runs parallel to San Francisco. Therefore, the answer has to be 4 radians or 229.2 degrees. The lines drawn below are only approximations, so are not pinpoint. 4 radians or 229.2 degrees passes over San Francisco somewhere in the vicinity of the airport - but this isn't the answer. If we add back the magnetic north value of 17 degrees in 1970, it equals 246.2 degrees. After all, Zodiac stated on the map, it was "to be set to Mag.N." 
How do we know 246.2 degrees is the correct angle to be subtended from Mount Diablo? The answer is simple - Zodiac told us so. Place the crosshairs above over a compass rose. A line subtended from the center of the compass rose passes exactly through the center of the bold black circle. In other words, the bold black circle is positioned at 246.2 degrees around the crosshairs. This is 4 radians + 17 degrees (magnetic north). Now all we have to do is find the inches subtended along the 246.2 degree line. This is even easier.     

The map scale is 6.4 miles to the inch, so the geography of San Francisco is self-constraining.
It is approximately 26.5 miles to the eastern edge of San Francisco from Mount Diablo (using the angle of 246.2 degrees).
4 inches would equal 25.6 miles, therefore, 4 inches subtended from Mount Diablo would land in the sea. Unless the Zodiac Killer had a submarine to bury his bomb this is not very likely.
It is approximately 34 miles to the western edge of San Francisco from Mount Diablo (using the angle of 246.2 degrees). 
6 inches would equal 38.4 miles and again would land in the sea.
Therefore, the answer has to be five inches along the 4th radian (plus magnetic north of 17 degrees). If this lands over the San Francisco Police Department we are in business. But first, we shall fill in the '32 Symbol' code using the words or clue given by the Zodiac Killer in the July 26th 1970 'Little List' letter.  
The section below is almost the complete solution to the '32 Symbol' cipher. Note how the Zodiac Killer inserts a hashtag style character between the "&" and "inches", with an arrow pointing between these two pieces of text. He is telling us to insert something here. We know from the above calculation it must be five inches, thereby completing the phrase:
"P.S The Mt.Diablo code concerns Radians & five inches along the radians"
​

The Zodiac Killer wasn't totally accurate, because the phrase should have read "P.S The Mt.Diablo code concerns Radians & five inches along the radian". The five inches to be subtended along the 4th radian (plus magnetic north) = 246.2 degrees. 
There are only three repeating characters in the code below, the triangle, the letter C and the letter O. With the inserted solution, these three characters are now represented by R, A, N, N, E and N. 

It was there in the Zodiac Killer's words all along; "The Mt.Diablo code concerns...... Radians & inches along the radian"
The last thing we have to do is place the large crosshairs with the black circle over the map of Mount Diablo, San Francisco and Vicinity. The location where the intended bomb was to be set should be 246.2 degrees and 5 inches subtended along a line drawn from Mount Diablo. It should also land over something to do with the San Francisco Police Department. Bearing in mind this was 1970 and the Zodiac Killer was using a ruler over a map, one eighth of an inch or so would be an acceptable margin of error, based on a map scale of 6.4 miles to the inch. The center and style of the black bold circle may be representative of a designer who intended the target to fall within this circle.  
There was no room on the map below, but we can see that if the superimposed crosshairs were expanded over the city of San Francisco, the center of the bold black circle subtended at 246.2 degrees for 5 inches would fall over the San Francisco Police Department at Ingleside Station. 
Ingleside Police Station is 31.06 miles from Mount Diablo. There are 6.4 miles to the inch. So Ingleside is 4.85 inches along the subtended angle of 246.2 degrees. Allowing for the leeway of crude measurement, this is 97% accurate in respect to 5 inches over the distance involved. This is why the Zodiac Killer placed SFPD next to the bold circle - it represented zero in mocking fashion, but more crucially, it represented the location of where the bomb was intended to be set - Ingleside Station or somewhere close by.              

Richard Radetich, the fallen officer, possibly referred to in the Zodiac Killer 'Button' letter was initially assigned to Ingleside Police Station, before moving to Park Station and eventually to Accident Investigation.

The following will again be a little bit of mathematical trickery regarding the 'Halloween', '13 Hole' and 'Pines' cards- placing the number 888 (Jesus) alongside each and every one.  From the 408 cipher split into three lines of 8, the 'near Zodiac' on the 20th line of the 340 forming 888, the three 8's on the '13 Symbol' cipher, coupled with the same code being used to find 444 in the final two ciphers, we will now move on to the final three cryptic cards in the Zodiac repertoire. To understand this presentation, it is important to read two previous articles 'The Bible Code of a Killer' and '340 Cipher-Embedded Symmetry'.  However, it must be stressed that this is not claiming a definitive solve to the Zodiac mystery and must be viewed with a health warning.

​In every correspondence mentioned above, it was claimed the Zodiac was attempting to place his name alongside the name of Jesus, the savior of souls for the afterlife: "All the (people) I have killed will become my slaves. I will not give you my name because you will try to slow down or stop my collecting of slaves for my afterlife." He wouldn't give us his name, but he may have given us Jesus. Here is the next cryptic correspondence with two unusual features, using the identical code employed to find 444 in both the final two canonical ciphers. The Zodiac again places his name alongside Jesus in the form of a messiah complex (also known as the Christ complex or savior complex).
Using the Zodiac code above, it was applied to the '13 Hole' postcard below, giving out the figures 43+120+347+36+342 = 888.
Jesus, the savior of souls, is now firmly alongside the Zodiac Killer once again. You will notice that the number 13 has been converted to one and three. This is done to transfer it into text form (to enter into the Zodiac code), exactly the same technique employed in the two previous ciphers, where the Omega, Taurus and Aries symbols were also converted into text form.
If we had left the figure 13 alone, that line would have totaled 360 (the degrees in a circle). Giving us 13 and 360 (13 punch holes). 

The next correspondence was the 'Halloween' card mailed on October 27th 1970. But this marked a deviation in the Zodiac's thinking. He was now likely trying to simplify things in an effort to push us towards Jesus- Hallelujah.
In the flap of the envelope he writes "sorry no cipher" twice, in the form of a multiplication sign. He could easily have written  "sorry no cipher" once, but evidently wanted to form the multiplication sign as an offering to our savior. If there was no cipher, then there is no code. The only 'cipher-like code' on the 'Halloween' card is the configuration of letters (not dissimilar to the "sorry no cipher" offering). The Zodiac intersected Paradice and Slaves, with four quadrants containing the words By Fire, By Gun, By Rope and By Knife. Was the word By a form of multiplication.
       

Using the path of least resistance we added up the letters in the 'cipher-like code', which totaled 37, and multiplied it by "sorry no cipher", placing it over the cross of Paradice and Slaves, as both formed a similar design. There are 24 letters in the four quadrants, giving us 37 X 24 = 888.
There were 37 letters in the 'cipher-like code' and we needed a number to multiply it by. In this case 24.
The next postcard was the 'Pines card' mailed on March 22nd 1971. If the Zodiac was simplifying matters, then this card would follow the identical technique displayed in the 'Halloween' card.
The 'Pines' card offered a set of 5 phrases.[1] 'Sierra Club'  [2] 'Sought Victim [3] 'Peek through the pines' [4] 'pass Lake Tahoe areas'  [5] 'around in the snow.'
The letters on this card would add up to exactly double the amount on the 'Halloween' card- exactly 74. 
We again needed a number to multiply it by. So let us take a punt on the figure 12 which the Zodiac supplied. 
​74 X 12 = 888 once again.  

But would the old Zodiac code resurface in one final offering on the 'Pines' card front- pushing us in both directions. 
The Zodiac drew our attention to Paul averly=chronicle.
Using the Zodiac code at the top of this page:
PAUL AVERLY = 3162 155522 = 32
CHRONICLE = 365215325 = 32
Thereby giving us PAUL AVERLY=CHRONICLE.

This completes the 888 and 444 sequence through seven cryptic Zodiac communications. But whether it is really there, or just a case of mathematical trickery and wordplay, is something only Zodiac knows.
Maybe the afterlife holds all the answers.

THE BIBLE CODE OF A KILLER

The Zodiac created four ciphers, of which only one has ever been solved and confirmed by overwhelming consensus. 
The third code is simply too short to achieve any meaningful decryption and the 'Button' letter '32 Symbol' code has only three repeating characters, making these two codes, without a key, effectively unbreakable. If we had the key however, then we would be back in business.
​It is perfectly reasonable after the solve by Donald Gene and Bettye June Harden in the August of 1969, to believe that all the remaining ciphers contain a message, after all, what would be the point of them other than a joke on Zodiac's part.
​It is my contention that the remaining three ciphers are all probably linked by religion, and Jesus Christ in particular.
The Zodiac chose a Celtic Cross style moniker, talked of "paradice" and the "afterlife," and placed crucifix style designs in his 'Halloween' and '13 Hole' postcards. You could say the Zodiac Code was the forerunner to the Da Vinci Code.
The key to the Zodiac Code is the previously discussed '13 Symbol' cipher, where the Zodiac splits the alphabet A through M to expose perfect symmetry in the third cipher. This is the template we shall use in the '13 Symbol' and '32 Symbol' ciphers, and in both instances arrive at exactly the same holy number. 
The Zodiac crosshairs can be noted in every cipher or code, so it is imperative we derive a mathematical figure for this moniker. But first we shall present the Zodiac Code that will be used on both ciphers.

The alphabet on the right has been split symmetrically into two halves. A through M was used in the Embedded Symmetry article, in which only the numbers 3, 1 and 5 were ever generated. The number 315 can be generated in several ways using the Zodiac Killer communications, but the simplest way is to take the Zodiac horoscope.
The Zodiac used what appeared to be an upside-down Aries symbol on the April 20th 1970  '13 Symbol' cipher. Many people also considered that the three circled 8's were in fact three circled Taurus symbols. But the reason the Zodiac Killer circled them, was possibly so they could be interpreted as both. Since we are dealing with the Zodiac horoscope, we will take the characters as one Aries and three Taurus symbols.

On the left is the Zodiac horoscope placed into the Zodiac Code (above).
This generates the figure 315 for the Zodiac crosshairs. 
Because we will be using Aries and Taurus in the '13 Symbol' cipher, I will explain how to arrive at the figures in brackets:
ARIES = A+R+I+E+S = 1+5+5+5+6 = 22.  
TAURUS = T+A+U+R+U+S = 7+1+6+5+6+6 =31.
ARIES =22, TAURUS = 31.

Before we move on it is important to mention the following again.
'In Christian numerology, the number 888 represents Jesus, or sometimes more specifically Christ the Redeemer. This representation may be justified either through gematria, by counting the letter values of the Greek transliteration of Jesus' name, or as an opposing value to 666, the number of the beast. Wikipedia.
In English gematria the figure for Jesus is 444'.  
If the Zodiac was creating his own bible code and referencing the rebirth of Christ using the number 8 for infinity, one would hope to find the figure 444 in the '13 Symbol' cipher shown below.  
​
Let us proceed and place the numbers alongside the relevant characters (see below). 
Notice again how the alphabetical characters only produce the figures 3, 1 and 5, as does the figure 315 representing the Zodiac crosshairs. 
The total value of the '13 Symbol' cipher is 444, representing Jesus. 

​We shall now move on to the '32 Symbol' cipher mailed just two months after the previous cipher. It contained only three repeating characters, the letter C, the letter O and the clear triangle, making it impossible to solve without a recognized key.
This led me to believe that these two ciphers were only solvable by some form of mathematical key.
Below I have used the same technique, using the Zodiac Code, representing the letters of the '32 Symbol' cipher by numbers. The Zodiac crosshairs are again attributed the 315 value and the Aries symbol the figure 22 once more. This time however, we have an Omega symbol, so we have to attribute it a figure.
OMEGA = O+M+E+G+A = 2+1+5+7+1 = 16. The six geometric shapes in the '32 Symbol' cipher cannot be attributed a name, and therefore cannot be attributed a value. They have been marked with a red X. 
You can see below, that when the numerical values are added up we arrive at the figure 444 once again.
Zodiac representing the figure 888, and both the remaining ciphers totaling 888. Whether it be 444 or 888, the reference to Jesus or Jesus Christ through the bible code of the Zodiac Killer is certainly possible. 

​The '408' cipher was divided up into three parts and mailed to the San Francisco Chronicle, Vallejo Times-Herald and San Francisco Examiner newspapers, but the final 18 characters of this cipher were unable to be decoded. Many speculated as to whether this was just filler to create three equal parts of 8 lines. Was this the rudimentary beginnings of 888, that he would carry through to his remaining ciphers and the name Zodiac itself? 

340 CIPHER- EMBEDDED SYMMETRY

This is a rehash of earlier articles concerning the 340 cipher and 13 Symbol cipher, regarding their symmetry and correlation to one another. If you are familiar with the 888 theory, then you need go no further.
The 340 cipher was the second cipher mailed on November 8th 1969- the 13 symbol cipher was the third cipher mailed on April 20th 1970, separated by just over five months. The Zodiac would refer to his 340 cipher at the beginning of the April 20th letter, stating: "This is the Zodiac speaking. By the way have you cracked the last cipher I sent you. My name is...."
This could be a simple clue leading into his new cipher, however, the author of the letter is highly unlikely to submit his real name. In addition, it is simply too short a code to be verifiable, and the Zodiac Killer must surely have known this if he had any rudimentary knowledge of code breaking. But with a clue or key affixed to the 13 symbol code, then we may have a chance.
Up to this point in time we only knew the murderer by the pseudonym Zodiac, so let us complete the introduction on the April 20th 1970 letter: "This is the Zodiac speaking. By the way have you cracked the last cipher I sent you. My name is Zodiac."  This however sounds a little flawed, so it is imperative we replace Zodiac with an alternative, something possibly embedded within the name Zodiac itself. 

​The 340 cipher has been entered into every powerful computer known to man with no solution being found, leading many people to believe it has no solution at all, and is in effect total 'gibberish.'  I don't know about the entirety of the 340 cipher, but the final twentieth line of the cipher does contain perfect symmetry in six of the final eight characters. In addition eight of the final nine characters are effectively carried forward from the 340 cipher to the 13 Symbol cipher, linking cipher two and cipher three together. In the 13 Symbol cipher he did refer to "My name is..," so we will look for his pseudonym in the 340 cipher and take this as the clue. 
We already know that six symbols on the twentieth line of the 340 cipher look very similar to his pseudonym Zodiac, but was this unintentional or deliberate. To find this out we shall look at the symmetry of both ciphers.
The 13 symbol cipher from a character standpoint is extremely organized. It starts and ends with three alphabetical characters. The three circled 8's are symmetrically placed in positions 5, 7 and 9. The Zodiac symbol and 'upside down Aries' symbol are four in from either side. Either the Zodiac just happened upon this symmetry, or he designed it for purpose.
Bearing this symmetry in mind, we will look for a symmetrical answer in both the 340 cipher and 13 Symbol cipher, and in addition symmetry between the two.
The Zodiac Killer was undoubtedly an egotist, so it wouldn't be all that surprising if he used his own pseudonym in the clue, and embedded the answer within the name Zodiac. In the following examination I will be using the identical mathematical technique on both the 340 cipher and 13 Symbol cipher, to show perfect symmetry in both instances. It was this egotism that led me to believe the clue resided in the 'near' Zodiac on the twentieth line of the 340 cipher. So using a comparison technique, I placed the proper spelling of Zodiac under the 'near' Zodiac and simply counted the numerical alphabetical difference in the columns. But first let us take a look at the 13 Symbol cipher and note the bottom two lines in the diagram below.
Because of not only the existing symmetry within this cipher, but the fact it was thirteen characters in length, began with an A and ended with an M, along with Zodiac's penchant for word games, it seemed the obvious choice to place the first 13 letters of the alphabet under the cipher. 
A to A = 0, B to E = 3, C to N = 11, F to K = 5, H to M = 5, K to N = 3, A to L = 11. 
It is achieved by staying within the alphabet and counting the numerical distance between the letters. Obviously, when we do not have two alphabetical characters there can be no difference, so a zero is attributed. You could attribute an X, it actually makes no difference to the resulting symmetry.

​Highlighted in red and green the obvious symmetry can be observed. But how likely can this be created by accident. 
By taking the three circled 8's as H's, it can still be seen that only three natural numbers are ever produced - 3, 1 and 5. 
How do we know if this is the technique that Zodiac employed? If we apply this technique to the 'near' Zodiac on the twentieth line of the 340 cipher using the correct spelling of Zodiac and it again produces perfect symmetry, then we have possibly bolstered our case. If, in addition, it produces something significant that relates to the 13 Symbol cipher, does it then become even more compelling? The most obvious choice this time is to place Zodiac underneath the six symbols on the twentieth line, like so:

Using the identical technique we used in the 13 Symbol cipher, we shall again count the numerical difference in the columns.
Z to Z = 0, O to O = 0, D to triangle = 0, I to A = 8, A to I = 8, C to K = 8.
That is three 0's and three 8's, carried forward to the 13 Symbol cipher on April 20th 1970. But that is not all.
Either side of the 'near' Zodiac on the twentieth line of the 340 cipher we have the crosshairs and an 'inverted Aries' in part.  
Both of which are situated on the 13 Symbol cipher, either side of the circled 8's (shown in the red rectangular boxes above).
This means, that effectively eight characters out of the last nine were effectively carried forward from the 340 cipher to the 13 symbol cipher. It could be argued that the last eight characters of the 340 cipher were carried forward, the plus sign (+) at the end of the 340 cipher signifying their addition to the 13 Symbol cipher.
​Zodiac is now represented by the three circled 8's. 'In Christian numerology, the number 888 represents Jesus, or sometimes more specifically Christ the Redeemer. This representation may be justified either through gematria, by counting the letter values of the Greek transliteration of Jesus' name, or as an opposing value to 666, the number of the beast.' Wikipedia. This may be important when we consider the Zodiac's tendency to speak of "paradise" and the "afterlife" in many of his communications, in particular his 408 cipher. He would also cross "paradice" and "slaves" in the form of a crucifix on the Halloween card, as well as pasting a red crucifix on the 13 Hole postcard.  
You can see in the above diagram that the letters K and M are embedded within the three 8's and therefore embedded in the name Zodiac. Were these his initials, and was he elevating himself to divine status? He certainly had the ego for it.

# There are some additional features of interest:
The 408 cipher was divided up into three sections of 8 lines and mailed to three different newspapers.
The final line of the 408 cipher contains an M and reversed K.
The final line of the 340 cipher contains an M and reversed K.
The 13 Symbol cipher contains the letter M and K.
The final character at the end of each of the three communications of the 408 cipher is either an M or reversed K.
The top line of the 32 Symbol cipher mailed on June 26th 1970 contains an M and reversed K.

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The Zodiac created four ciphers, of which only one has ever been solved and confirmed by overwhelming consensus. 
The third code is simply too short to achieve any meaningful decryption and the 'Button' letter '32 Symbol' code has only three repeating characters, making these two codes, without a key, effectively unbreakable. If we had the key however, then we would be back in business.
​It is perfectly reasonable after the solve by Donald Gene and Bettye June Harden in the August of 1969, to believe that all the remaining ciphers contain a message, after all, what would be the point of them other than a joke on Zodiac's part.
​It is my contention that the remaining three ciphers are all probably linked by religion, and Jesus Christ in particular.
The Zodiac chose a Celtic Cross style moniker, talked of "paradice" and the "afterlife," and placed crucifix style designs in his 'Halloween' and '13 Hole' postcards. You could say the Zodiac Code was the forerunner to the Da Vinci Code.
The key to the Zodiac Code is the previously discussed '13 Symbol' cipher, where the Zodiac splits the alphabet A through M to expose perfect symmetry in the third cipher. This is the template we shall use in the '13 Symbol' and '32 Symbol' ciphers, and in both instances arrive at exactly the same holy number. 
The Zodiac crosshairs can be noted in every cipher or code, so it is imperative we derive a mathematical figure for this moniker. But first we shall present the Zodiac Code that will be used on both ciphers.    

The alphabet on the right has been split symmetrically into two halves. A through M was used in the Embedded Symmetry article, in which only the numbers 3, 1 and 5 were ever generated. The number 315 can be generated in several ways using the Zodiac Killer communications, but the simplest way is to take the Zodiac horoscope.
The Zodiac used what appeared to be an upside-down Aries symbol on the April 20th 1970  '13 Symbol' cipher. Many people also considered that the three circled 8's were in fact three circled Taurus symbols. But the reason the Zodiac Killer circled them, was possibly so they could be interpreted as both. Since we are dealing with the Zodiac horoscope, we will take the characters as one Aries and three Taurus symbols. 

On the left is the Zodiac horoscope placed into the Zodiac Code (above).
This generates the figure 315 for the Zodiac crosshairs. 
Because we will be using Aries and Taurus in the '13 Symbol' cipher, I will explain how to arrive at the figures in brackets:
ARIES = A+R+I+E+S = 1+5+5+5+6 = 22.  
TAURUS = T+A+U+R+U+S = 7+1+6+5+6+6 =31.
ARIES =22, TAURUS = 31.

Before we move on it is important to mention the following again.
'In Christian numerology, the number 888 represents Jesus, or sometimes more specifically Christ the Redeemer. This representation may be justified either through gematria, by counting the letter values of the Greek transliteration of Jesus' name, or as an opposing value to 666, the number of the beast. Wikipedia.
In English gematria the figure for Jesus is 444'.  
If the Zodiac was creating his own bible code and referencing the rebirth of Christ using the number 8 for infinity, one would hope to find the figure 444 in the '13 Symbol' cipher shown below.  
​
Let us proceed and place the numbers alongside the relevant characters (see below). 
Notice again how the alphabetical characters only produce the figures 3, 1 and 5, as does the figure 315 representing the Zodiac crosshairs. 
The total value of the '13 Symbol' cipher is 444, representing Jesus. 

We shall now move on to the '32 Symbol' cipher mailed just two months after the previous cipher. It contained only three repeating characters, the letter C, the letter O and the clear triangle, making it impossible to solve without a recognized key.
This led me to believe that these two ciphers were only solvable by some form of mathematical key.
Below I have used the same technique, using the Zodiac Code, representing the letters of the '32 Symbol' cipher by numbers. The Zodiac crosshairs are again attributed the 315 value and the Aries symbol the figure 22 once more. This time however, we have an Omega symbol, so we have to attribute it a figure.
OMEGA = O+M+E+G+A = 2+1+5+7+1 = 16. The six geometric shapes in the '32 Symbol' cipher cannot be attributed a name, and therefore cannot be attributed a value. They have been marked with a red X. 
You can see below, that when the numerical values are added up we arrive at the figure 444 once again.
Zodiac representing the figure 888, and both the remaining ciphers totaling 888. Whether it be 444 or 888, the reference to Jesus or Jesus Christ through the bible code of the Zodiac Killer is certainly possible. 

The '408' cipher was divided up into three parts and mailed to the San Francisco Chronicle, Vallejo Times-Herald and San Francisco Examiner newspapers, but the final 18 characters of this cipher were unable to be decoded. Many speculated as to whether this was just filler to create three equal parts of 8 lines. Was this the rudimentary beginnings of 888, that he would carry through to his remaining ciphers and the name Zodiac itself ? 

http://www.zodiacciphers.com/zodiac-news/340-cipher-embedded-symmetry   

In analyzing the 'Button' letter map and code mailed on June 26th 1970, it is imperative we take a close look at the Zodiac Killer correspondence in the preceding few months to this communication for any clues to his mindset and intentions. There will be no definitive solution to the 32 symbol code presented here, although a location for where his bomb was 'to be set' can be argued with confidence, using four pieces of Zodiac material.
On April 20th 1970 the killer mailed 'The My Name is..Cipher' and stated "I hope you do not think that I was the one who wiped out that blue meannie with a bomb at the cop station.  Even though I talked about killing school children with one. It just wouldn't doo to move in on someone else's teritory.  But there is more glory in killing a cop than a cid because a cop can shoot back." The Zodiac Killer was referring to the murder of San Francisco police officer Brian McDonnell on February 16th 1970, two months earlier, when a bomb exploded on an outside ledge of Park Police Station in the Upper Haight neighborhood. See here. 
He would back up this correspondence with the 'Dragon Card' just one week later on April 28th 1970 declaring "I hope you enjoy yourselves when I have my blast." This card featured elements of the book Don Quixote, a novel by Miguel de Cervantes Saavedra, in which Alonso Quijana, a prolific reader of books, became so mesmerized by the chivalry contained within them, that under the assumed name of Don Quixote, along with his squire Sancho Panza, began a quest to revive this virtue. What the Zodiac Killer was inferring with this particular card can be debated, but the 1899 Waller Street Police Station is situated on the boundary of the San Francisco Golden Gate Park and in close proximity, also situated in the park, is the memorial statue of Miguel de Cervantes, featuring Don Quixote and Sancho Panza. Was the Zodiac Killer insinuating an attack close to the police station and park, similar to the murder of police officer Brian McDonnell.  

Then on June 26th 1970 this communication arrived, insinuating the murder of another police officer, Richard Radetich (25). On June 19th at 5.25 am he was gunned down by three shots from a .38 caliber revolver at point blank range through the driver side window of his vehicle, while in the process of serving a parking ticket by 643 Waller Street, San Francisco, in the Lower Haight District and subsequently died 15 hours later. The murder of Richard Radetich, as of writing, remains unsolved.
​The Zodiac Killer appeared to be heavily centering his focus in the Haight District. The statue in the park, 1899 Waller Street and 643 Waller Street all fall within a 2 mile radius, featured through three consecutive mailings.
It is therefore this locality of San Francisco we shall again turn our attention to, when considering where the Zodiac Killer may be directing his threat towards in the Button letter, using recent history to predict the future.
There is good reason to believe the Zodiac Killer was threatening an attack on Ingleside Station-San Francisco Police Department, located at 1 Sgt John V Young Lane, named in honor of Sgt. John Young, killed by gunmen in 1971 after they stormed the police station. Ingleside Station is 4.6 miles south of 1899 Waller Street. The Zodiac Killer never followed through on many of his claims, but this may very well be the location he was threatening to bomb on June 26th 1970. So here is the evidence.
When the Zodiac Killer mailed the Button letter, it was accompanied by a Phillips 66 road map and his crosshairs, stating they were "to be set to Mag.N." That is magnetic north, calculated at 17 degrees in 1970. Clearly he soon realized that the information or code he supplied, coupled with the Phillips 66 map, was insufficient to crack the cipher or determine a location for the bomb. One month later he rectified the problem with the Little List letter mailed on July 26th 1970, when he incorporated two further crosshairs, with all the clues we needed.     

This was the first crosshair on the right.
The Zodiac Killer continually taunted police with his running victim total, always attributing the police with zero. This was nothing new. However here he deliberately brings attention to the zero, marking it noticeably darker, as though it has increased significance. It is also placed within the crosshairs, indicating an area within his sights.
Bearing in mind the acronym SFPD, it is clear he has the San Francisco Police Department firmly focused as his target. That police department, we will attempt to show, was Ingleside Station located just off Balboa Park at San Jose Avenue.
The Zodiac Killer sent us a second set of crosshairs in the Little List letter stating "PS. The Mt Diablo code concerns Radians + inches along the radians."
This was the clue we needed.
In a previous article we highlighted a region of San Francisco for particular interest, using the following technique, but with improved map plotting and examining carefully the Phillips 66 map, it has become apparent the amended focus should be squarely over Ingleside Police Station.
The phrase "PS. The Mt Diablo code concerns Radians + inches along the radians," clearly tells us to use radians as our degrees from the north axis and is "to be set to Mag.N."  So we are looking for whole radians, to which we then add in the magnetic north value of 17 degrees. This will give us our angle on the Phillips 66 map.
The​ bold circle above is sitting between the 180 and 270 degree axis. In fact the center of the bold circle is positioned at 246 degrees. This can be confirmed using a compass rose. One radian is valued at 57.296 degrees, so four radians are valued at 4 X 57.296 = 229.184 degrees. Add in the magnetic north value of 17 degrees and our final total is 246.184 degrees.
The Zodiac Killer was indicating four radians + magnetic north. He never incorporated this into the Button letter code and Phillips 66 map, telling us the crosshair was to be set to magnetic north, but a month later in the Little List letter, he added the magnetic north value in for us, seen by the positioning of the bold circle next to SFPD. Four radians and 17 degrees is 246 degrees. This bold circle is also positioned at exactly 246 degrees (see below). 

This compass rose and SFPD crosshair, angled at 246 degrees can now be placed over the Phillips 66 map. But first we will examine the second  crosshair placed at the foot of the Little List letter.
The Zodiac Killer placed 'Diablo', the Spanish word for devil over the 180 degree axis. This may not have any significance, but if we couple the 66 from Phillips 66, with the number 6 on the Phillips map crosshair, we get 666, the number of the beast. By using the same method we can add the number 66 to the 180 degrees and arrive at 180 + 66 = 246 degrees once more.
Whether this was by design however, is open to question.
Let us now go ahead and superimpose the compass rose and SFPD crosshair over the Phillips 66 map (below).
To be completely accurate, both have been tilted by three degrees to match the original Zodiac crosshair. (shown here).
246 degrees takes us, as the crow flies, 31 miles southwest, passing directly over Ingleside Station-San Francisco Police Department (SFPD). The map scale is 6.4 miles to the inch, so if we were traveling inches along the radians, it would be 4.84 inches.  
If we round off, the phrase "PS. The Mt Diablo code concerns Radians + inches along the radians," would become: "PS. The Mt Diablo code concerns four Radians + five inches along the radians." That is 229 degrees, but set to magnetic north gives us the 246 degrees shown in the diagrams. 

The Button letter code however, as mentioned above, would not incorporate the exact angle or directions to Ingleside Station. Remember the Zodiac Killer stated "The Map coupled with this code will tell you where the bomb is set."
The map crosshair told us to "set to Mag. N", which was 17 degrees. So if the code had an angle within it, this angle would be 229 degrees (before it is coupled with the map).
With 29 unique characters in the 32 symbol code, simple substitution is not an option. Some form of key must be unearthed.
Below are two incorrect examples of what we may be looking for. The first example matches all the repeating characters, even the dotted circle, but makes no sense. The second is more recognizable as a logical sentence, but matches little within the code. You may have a better solution. 
Ingleside Police Station may very well have been the target of the Zodiac Killer, but without breaking the code, it will remain a possibility rather than a proven fact. Thank you for your time. 

We as humans fall into patterns or habits, that may last for months, years, or even a lifetime, depending on our circumstances at any given point. The Zodiac Killer may have changed weapons, vehicles or his residency during his reign of terror from December of 1968 to his eventual drift into complete anonymity, so the concept of this article is to focus in on the last three chronological attacks he committed or claimed to have committed. That of Paul Stine, murdered in Presidio Heights, San Francisco on October 11th 1969, the abduction of Kathleen Johns near Modesto five months later, on March 22nd 1970 and finally the murder of Richard Radetich on June 19th 1970, in his police car near 643 Waller Street, San Francisco. These three attacks spanned an eighth month period, after which no future crimes were ever directly claimed by the Bay Area Killer. 
Two of these three crimes deviated from his previous attacks, in the sense the killer actually positioned himself within the vehicle with the victim, as a passenger in Presidio Heights and as the driver on Highway 132, near Modesto. But are the crimes linked in any other way. What follows are slim pickings, however we shall proceed.   
  

A white car was noted precedent to the Lake Herman Road murders by several eyewitnesses, notably a 1959/60 Chevrolet Impala. The factory specifications show this 1960 model of Chevrolet was produced in Ermine White. The color has a distinctive brown hue, which is further enhanced under dim or artificial light conditions. 
Kathleen Johns described the assailant's vehicle as light tan. On the same evening as the Kathleen Johns abduction, two men, Frederick Beaman and William Horton were traveling on Highway 132, near Highway 33 and Interstate 580, when a man passed them in a white 1959 Buick, continued about a mile down the road where he pulled up and attempted to flag them down. They continued on without stopping. The incident was reported to Sergeant Hall of the Stanislaus County Sheriff's Office on March 23rd 1970, the day after the Kathleen Johns abduction. They had read the abduction account in the Modesto Bee newspaper and believing it to be relevant information, reported it to authorities. Whether these two vehicles are one and the same will never be known, however three months later Richard Radetich was murdered and another white car would come into play.
The Zodiac Killer on April 20th 1970, in his '13 Symbol' cipher correspondence, intimated the murder of a policeman, stating "There is more glory in killing a cop than a cid because a cop can shoot back." Two months later Richard Radetich was dead, gunned down by three shots from a .38 caliber revolver at point blank range through the driver side window of his vehicle, while in the process of serving a parking ticket. A crime the Zodiac Killer would claim only seven days later.
Curiously, a white car was spotted speeding away from the area of the murder that night. A gas station attendant recalled seeing a white Cadillac racing down Oak Street and entering Divisadero Street only 0.3 miles from the murder scene. Could this white car have been the one observed in the area of Highway 132. It's a stretch. So let us examine any parallels between the last two murders claimed by the Zodiac Killer, separated by only eight months and 2.5 miles. View here on Google Maps.

The Zodiac Killer traveled in Paul Stine's taxicab along Washington Street, yet when he exited from the crime scene and headed up Cherry Street, he effectively backtracked on himself. He headed east along Jackson Street, when he may as well have exited the taxicab at least one block earlier, the destination of Washington and Maple, written on the trip sheet. It is, as though he had his plans changed by unforseen circumstances or was leaving a 'buffer zone' to his vehicle or residence.
Parking his vehicle somewhere near to Jackson Street, to travel away to the theater district, to then hail a taxicab, to enable his return to Presidio Heights, to commit a murder and make his escape by vehicle, has always seemed a convoluted way of perpetrating a crime. There are far easier ways of negotiating this crime. The movements of the killer also suggest there was no vehicle lying in wait, somewhere by Jackson Street, as eyewitness recollections and Zodiac ramblings in the Bus Bomb letter seem to concur.
Zodiac indicated he entered the park at Spruce Street "p.s. 2 cops pulled a goof abot 3 min after I left the cab. I was walking down the hill to the park when this cop car pulled up + one of them called me over + asked if I saw anyone acting suspicious or strange in the last 5 to 10 min + I said yes there was this man who was runnig by waveing a gun & the cops peeled rubber + went around the corner as I directed them + I disappeared into the park a block + a half away never to be seen again."  
This was corroborated by eyewitnesses in Spruce Street, who described a man similar in nature to the three teenagers and Donald Fouke, seen running into the Julius Khan playground entrance.               

The Zodiac Killer would further state in the Bus Bomb letter that "The dogs never came with in 2 blocks of me + they were to the west."
The sniffer dogs were assembled by the Julius Khan playground, so at this point in time Zodiac had obviously moved eastwards by two blocks, now placing him in the bushes opposite Laurel Street. 
The dogs were fanning across the park from the north, west and south (by the park entrance). The Zodiac Killer had only one option, the one he had most likely already planned, to head for the safety of home, so continued eastwards. His final directional statement was "there was only 2 groups of parking about 10 min apart then the motor cicles went by about 150 ft away going from south to north west." The only possible vantage point that belies this statement, are the bushes and trees bordering Presidio Boulevard (see here). From here the motorcycles circling the Presidio Park would be 150 feet from Zodiac, traveling along Presidio Boulevard from the 'south to the nothwest'.
"The S.F. Police could have caught me last night if they had searched the park properly instead of holding road races with their motorcicles seeing who could make the most noise. The car drivers should have just parked their cars and sat there quietly waiting for me to come out of cover." But they didn't. Zodiac took his opportunity once the motorcycles had passed and exited the park via Presidio Boulevard into the Cow Hollow region, on the eastern flank of the park. Was the killer's residence close by.  
Now of course, this is speculation, we cannot know for sure, but the Zodiac Killer's statements, allied to the eyewitnesses observations by Spruce Street are the only tangible snippets we have to go on regarding the events of October 11th 1969. Well almost....     

The Paul Stine letter was mailed from the Inner Richmond area two days later, very close to Presidio Park. If indeed the Zodiac Killer lived in the Cow Hollow region, bordering the park, this would certainly exhibit the 'least effort principle', where we, as humans tend to not expend any extra energy as to what is required, yet in the case of a serial killer, using a measure of caution, applying a buffer zone to his activity, is logical. In the case of Inner Richmond and Cow Hollow, this would be the bare minimum.
As stated earlier, a white Cadillac was observed speeding away from the Radetich murder, traveling on Oak Street, before turning north on Divisadero Street. The murderer had options after the killing, to travel east, west, north or south. The driver made three directional changes to enable a northerly heading on Divisadero Street. If the killer had proceeded north on Divisadero Street, he would eventually have passed Washington Street and Jackson Street into the Cow Hollow region, on the eastern fringes of Presidio Park and aligned with the directional movements of the Zodiac Killer on October 11th 1969. It's weak, but it's all we've got from the Zodiac and eyewitness testimony.
Finally, Alex Lewis secured the redacted FBI file, naming Xenophon Anthony as a possible subject in the murder of Paul Stine on October 11th 1969, who resided at 3218 Jackson Street. This is the only subject named by an eyewitness regarding all four confirmed attacks, so from this standpoint it carries some measure of weight, although from here the trail appears to go cold again. 3218 Jackson Street however is only 0.4 mile or 2 minutes west of Divisadero Street, and a stone's throw from Presidio Park.
The connections are weak, but the killer's movements are literally all we have to go on, and in both instances, that of the Richard Radetich and Paul Stine murder, a collision course somewhere along Jackson Street could be argued, along with a white vehicle, possibly identified three times, inside of three months, from the Modesto abduction of Kathleen Johns to the murder of Richard Radetich by 643 Waller Street.
There are many basement properties along Divisadero Street, and steep inclines from at least two directions entering the intersections, so I wonder.
"I have killed ten people to date. It would have been a lot more except that my bus bomb was a dud.  I was swamped out by the rain we had a while back." 
Throughout the Zodiac Killer's correspondence, the focus would remain on the San Francisco Chronicle, but did he work in the area, live there or possibly both. The jury is out.

On June 19th 1970 Sgt Richard Radetich was gunned down by three shots from a .38 caliber revolver at point blank range through the driver side window of his vehicle, while in the process of serving a parking ticket. He was sat in his police car near 643 Waller Street, San Francisco, in the Lower Haight District when he sustained life threatening injuries and subsequently died 15 hours later. Local residents heard a vehicle speeding away from the area, unfortunately however, the number of assailants present at the crime scene is unknown. The parking ticket Richard Radetich had just written, was for a 1965 Oldsmobile bereft of 1970 license tags, albeit, Police Chief Alfred J. Nelder at the time said they had no reason to suspect the owner of this vehicle in the commission of the murder. Detectives suspect the killer or killers pulled their vehicle alongside the officer's police car, and without exiting their vehicle, fired through the closed window, shattering the glass and fatefully striking Richard Radetich in the head. ​
A short distance from the crime scene (0.3 miles) a gas station attendant recalled seeing a white Cadillac racing down Oak Street and entering Divisadero Street. Officer Radetich's murder shocked the local community, as he left behind a wife, Nancy, and his eight month old daughter Janine. Seven days later, a letter from the Zodiac Killer arrived at the San Francisco Chronicle that suggested that he may have been the responsible- stating he "shot a man sitting in a parked car with a .38".  But, was the Zodiac Killer the murderer or was it an attempt to lay claim to somebody else's crime.
Two violent groups operating in the early 70s needed little prompting to come forward to admit their crimes, despite this however, neither the 'Black Liberation Army' or the 'Weather Underground' ever admitted any involvement in the Richard Radetich murder. As with this case, the Zodiac appeared extremely lucky to seemingly always lay claim to crimes that were never solved, or he was indeed was the murderer of Richard Radetich. 
On April 20th 1970, two months before this murder, Zodiac mailed his '13 Symbol' cipher to the San Francisco Chronicle and proclaimed "I hope you do not think that I was the one who wiped out that blue meannie with a bomb at the cop station. Even though I talked about killing school children with one. It just wouldn't doo to move in on someone else's teritory.  But there is more glory in killing a cop than a cid because a cop can shoot back.  I have killed ten people to date. It would have been a lot more except that my bus bomb was a dud.  I was swamped out by the rain we had a while back." 
The Zodiac Killer was referencing the murder of Sgt Brian McDonnell (44) on February 16th 1970, who was killed by a bomb packed with fence staples, planted on the window ledge of the 1899 Waller Street Park Police Station in Upper Haight, San Francisco. It seemed strange that the Zodiac Killer would deny this murder, stating "It just wouldn't doo to move in on someone else's teritory,"- because this murder took place in Upper Haight, less than 2 miles from the Richard Radetich murder in Lower Haight, to which he was intimating a link.  

Two months after the Brian McDonnell murder and eight days after his previous correspondence, the Zodiac Killer mailed the 'Dragon Card' on April 28th 1970, depicting what appears to be characters from a novel by Miguel de Cervantes Saavedra. 
Don Quixote, on his horse Rocinante, along with his squire Sancho Panza, perched on a nameless donkey, embark on a mission to restore chivalry.
The Zodiac Killer wrote on the face of the card "I hope you enjoy yourselves when I have my Blast." Was this postcard chosen for a specific reason- a case of Zodiac rubbing salt into the wounds of the San Francisco Police Department by bringing up the suggestion of another impending bomb. The 1899 Waller Street Police Station and location of the murder of Sgt Brian McDonnell is situated on the boundary of the San Francisco Golden Gate Park and in close proximity to the memorial statue of Miguel de Cervantes, featuring Don Quixote and Sancho Panza. So, was this card really just a random choice, or was the Zodiac Killer simply 'needling the blue pigs' with the threat of another blast.
Furthermore, standing outside the California Academy of Sciences in Golden Gate Park, just opposite the Miguel de Cervantes statue, is a memorial to Robert Emmet, an Irish nationalist. Robert Emmet the hippie was suggested as a solution to the indecipherable 18 characters at the foot of the Zodiac 408 cipher.   
Then came the 'Button' letter on June 26th 1970 hinting at the murder of Richard Radetich, despite earlier protestations it wouldn't do to move in on somebody else's territory. The murders in Upper and Lower Haight, and the Miguel de Cervantes Saavedra statue mentioned in these three correspondences by the Zodiac Killer, are all contained within a 2 mile radius.
Shortly after the murder of Richard Radetich a white Cadillac was spotted speeding north on Divisadero Street, from Oak Street. In a previous article it was reasoned that the Zodiac Killer, after the murder of Paul Stine, entered the Presidio Park and made his escape eastwards into the Cow Hollow region. A murderer heading northbound on Divisadero Street is on a direct collision course with the Cow Hollow region. Divisadero Street terminates at Marina Boulevard on San Francisco's northern edge. 
On July 24th 1970, the Zodiac Killer would claim his involvement in the abduction of Kathleen Johns just west of Modesto, California- a crime that has also gone unsolved- despite the claims of Kathleen Johns it was indeed the Zodiac. The contradictions and connections between the '13 Symbol' cipher, 'Dragon Card' and 'Button' letter are there for all to see- but did the Zodiac Killer ever take the unlikely step from 'needling the blue pigs' to killing them. 

643 Waller Street, San Francisco 

This topic has been discussed before in the article 'Mount Diablo-The Devil is in the Detail', however here we will hopefully finalize the story with the last piece of the jigsaw. The Zodiac Killer mailed us the Button Letter and Phillips 66 Petroleum Map on June 26th 1970 stating "The Map coupled with this code will tell you where the bomb is set. You have until next fall to dig it up."  Then one month later he mailed the Little List Letter on July 26th 1970, giving us a further cross-haired diagram and the phrase "PS. The Mt. Diablo Code concerns Radians & # inches along the radians." This was basically a further clue to push us in the right direction. 
​The first thing to look at is the Phillips 66 Map crosshair with numbers around its cardinal points, the number 0 facing north, the number 3 on the east axis, the number 6 on the south axis and finally the number 9 on the west axis. It is easy to consider these as clock points, however the number 12 is replaced by a zero, so we will refrain from doing so. But what relevance do these numbers have, bearing in mind we are looking for a grid position on where the bomb is set and considering a clock face does not begin on zero. The Zodiac mentioned 'radians and inches along the radians,' we know a radian to be valued at 57.296 degrees, so all we have to do is travel around the circumference of his crosshair situated over Mt Diablo, by a fixed number of radians. Then once we have found the correct amount of radians, we travel away from that point, along the radian in inches, until we locate the bomb. But how many inches. The only numbers we have are the ones Zodiac placed around the crosshair, and these are situated along the radian line, so these are what we'll use to formulate the answer.

On the right is the diagram the Zodiac Killer supplied us with in the Little List Letter, superimposed on a compass rose to find the angle of the bold circle. The Zodiac mentioned radians, not part of a radian, so we are dealing in whole amounts of 57.296 degrees. The Zodiac also wrote next to the crosshair on the Phillips 66 Map; "is to be set to Mag N." This meant Magnetic North, calculated at approximately 17 degrees in 1970. 4 radians = 4 X 57.296 = 229.184 + 17 degrees = 246 degrees. The bold circle the Zodiac gave us, shown in the diagram, is positioned at exactly 246 degrees. We now have the angle, so let us move to the second part of the equation, 'concerning inches along the radians.' The 246 degree line has to be given a number, in relation to the numbers Zodiac placed around the crosshair on the Mount Diablo Phillips 66 Map. Using the concept of 12 divisions of 30 degrees to form a whole circle of 360 degrees, what does 246 degrees represent. The number 3 the Zodiac gave us sits at 90 degrees, the number 6 sits at 180 degrees and the number 9 at 270 degrees, so 246 degrees would rest at 246 divided by 30.

246/30 =8.2. This gives us a quantifiable amount of inches to travel away from Mount Diablo. Don't forget the Zodiac gave us the phrase "PS. The Mt. Diablo Code concerns Radians & # inches along the radians."  The only place on the Phillips 66 Map where inches are mentioned, is in the grid scale at bottom left of the map, under where it states 'San Francisco and Vicinity.'  The scale states 'one inch equals approx 6.4 miles.'
We have 8.2 inches, so with a simple calculation we multiply 8.2 by 6.4, to give us our distance to travel away from Mount Diablo.
8.2 X 6.4 =52.48 miles. In other words the bomb is set 52.48 miles from Mount Diablo at an angle of 246 degrees. But bear in mind the Zodiac stated "The Map coupled with this code will tell you where the bomb is set. You have until next fall to dig it up."
So the code of 32 symbols has to tie in with this location.
Below is a diagram with an angle of 246 degrees radiating from from Mount Diablo, you will notice it passes over the bold circle Zodiac drew and lands in the area of San Francisco International Airport. In fact it is virtually 52.48 miles on Google Maps to this location. Here is the area of South Linden Avenue, right next to San Francisco International Airport, shown as being 52.90 miles from Mount Diablo.   

The next thing to do is look at the 32 symbol cipher the Zodiac constructed, and his statement "The Map coupled with this code will tell you where the bomb is set. You have until next fall to dig it up." It is my guess that the code is giving us a location and the red line of 246 degrees on the map above will bisect that location point. The only notable location we have unearthed is somewhere very close to San Francisco International Airport, so let us start with that.   

San Francisco International Airport is exactly 32 letters, like the code. But of course this is not conclusive. We have one other slight discrepancy, in that San Francisco International Airport is 31.15 miles from Mount Diablo as the crow flies. It is just a matter of what the Zodiac actually meant when he referred to "The Mt. Diablo Code concerns Radians & # inches along the radians." Was it meant literally in a direct line, or by using the map scale designed to give us our shortest traveling distance to the bomb location from Mount Diablo, using the 246 degree line as our guide. Was the use of the word 'concerns' to imply a less than literal translation. Setting a bomb close to the airport would certainly be a daring target for the Zodiac Killer, if it was ever to be set at all.

​http://www.zodiacciphers.com/zodiac-news/mt-diablo-the-devil-is-in-the-detail

In a recent article we examined the Mount Diablo code in conjunction with the Phillips Road Map and suggested a possibility that the Zodiac 32 Symbol Cipher may have revealed San Francisco International Airport, situated at 4 radians or 229 degrees from Mount Diablo, but coupled with the Magnetic North value of 17 degrees at the time of mailing, was to give us a final value of 246 degrees, exactly corresponding with the bold circle the Zodiac Killer provided within his crosshair on the Little List Letter he mailed on July 26th 1970.  View initial article (Part One). View Part Two.
This final part of the trilogy attempts to cement the motivation behind the Zodiac Killer's crosshairs he gave us on the Phillips 66 Road Map as part of the Button Letter mailed on June 26th 1970 and the Little List Letter one month later on July 26th 1970. In the following diagram we have incorporated the three crosshairs together to better explain the findings. This idea has been covered before, but finalizes the three part story under one banner in a little more detail.

The Zodiac Killer stated on the Button Letter 'The Map coupled with this code will tell you where the bomb is set'. In other words the two are to be used in conjunction with each other. This is what we did in the earlier articles, taking the code of San Francisco International Airport at 229 degrees and coupling it with the map, set at a Magnetic North value of 17 degrees, to arrive at the final value of 246 degrees.
However this would not have been possible using the Button Letter and Phillips 66 Road Map alone. The Zodiac realizing this gave us the two additional crosshairs on the Little List Letter, with a couple more hints. Firstly the bold circle and secondly the phrase 'PS The Mt Diablo code concerns Radians + inches along the radians'. The Zodiac Killer however placed this phrase over the crosshair itself, when he could have easily accommodated both elements separately, unless he had an ulterior motive.
The phrase runs over the lower north-south axis; to be precise over the 180 degree axis or number 6 on the Zodiac dial. In fact only the word Diablo is bisected by this line. 
Let us expand upon the 'Map coupled with this code will tell you where the bomb is set' to better explain things, using this phrase 'The Phillips 66 Map coupled with this code will tell you where the bomb is set'.
In the first instance the code of San Francisco International Airport or 229 degrees was coupled with the map set at Magnetic North of 17 degrees to equal 246 degrees. The Mount Diablo code was written on the 180 degree axis, so we will couple this 180 degrees with the map or more specifically the Phillips 66 Map, to give us 180 + 66 = 246 degrees, the exact position of the bold circle he provided us in the Little List Letter and exactly the same as 4 radians and 17 degrees. Then we shall take the number 6 he provided on the 180 degree axis and once again couple this with the Phillips 66 Map to give us 666, the mark of the Devil or Diablo. The conventional view is that the peak derives its name from the 1805 escape of several Chupcan Native Americans from the Spanish in a nearby willow thicket. The natives seemed to disappear, and the Spanish soldiers thus gave the area the name "Monte del Diablo", meaning "thicket of the devil."
Diablo was placed over the 180 and 6 axis and on both occasions coupled with the 66 from the Phillips 66 Road Map gave us something significant, but whether or not this was his true intention is still unclear and may never be resolved. 

In a recent article we examined the Mount Diablo code in conjunction with the Phillips Road Map and suggested a possibility that the Zodiac 32 Symbol Cipher may have revealed San Francisco International Airport, situated at 4 radians or 229 degrees from Mount Diablo, but coupled with the Magnetic North value of 17 degrees at the time of mailing, was to give us a final value of 246 degrees, exactly corresponding with the bold circle the Zodiac Killer provided within his crosshair on the Little List Letter he mailed on July 26th 1970. Here we will take this one step further and see where the adjustment of the Magnetic North value of 17 degrees takes us from the airport location and see if the pinpointed location makes any sense in respect to all we think we know about the Zodiac Killer. View initial article (Part One).  

It is difficult to be exact using the Zodiac diagrams, but the angle of 246 degrees passes over the Bayview-Hunters Point region of San Francisco, situated only 5.5 miles from the Mason and Geary intersection, where it is believed Paul Stine picked up the Zodiac Killer on October 11th 1969.
Passing through the Bayview area is 3rd Street and close by is Highway 101, two possible routes Paul Stine may have traveled on his return back from San Francisco International Airport after dropping off his final paying fare and returning back to the San Francisco theater district. The Bayview-Hunters Point region has a colorful history and has been the scene of much controversy and conflict down the years. 
After a San Francisco ordinance in 1868 banned the slaughter and processing of animals within the city proper, a group of butchers established a "butchers reservation" on 81-acre of tidal marshland in the Bayview district. Within ten years, 18 slaughterhouses were located in the area along with their associated production facilities for tanning, fertilizer, wool and tallow. The "reservation" (then bounded by present-day Ingalls Street, Third Street, from Islais Creek to Bayshore) and the surrounding houses and businesses became known as Butchertown. The butcher industry declined following the 1906 San Francisco earthquake until 1971 when the final slaughterhouse closed.
Taken from Wikipedia
If we insert a Zodiac timeline to this, the final slaughterhouse closed in 1971, the year the Zodiac mailed us his second to last confirmed correspondence on March 13th 1971, before he went on sabbatical for close to three years, although not suggested, the irony cannot be ignored. Also from our experience the undeniable suggestion the Zodiac Killer may have served in the military or have naval connections has been a constant. The Zodiac timeline is not certain, on account of earlier murders that may or may not be attributed to him, such as the Riverside murder of Cheri Jo Bates on October 30th 1966, nevertheless this is where we will start.  

Is there anything that ties Riverside, the Vallejo and Benicia areas and Bayview-Hunters Point in San Francisco. Well not exactly, but it doesn't hurt to explore one option.
The Long Beach Naval Shipyard, which closed in 1997, was located at Terminal Island between the city of Long Beach and the San Pedro district of Los Angeles and approximately 23 miles south of the Los Angeles International Airport. It was situated 1 hr 20 minutes drive west of Riverside. The Mare Island Naval Shipyard is located in Vallejo, the hot zone highlighted by Kim Rossmo, when using the art of geographical profiling to zoom in on a possible home location of the Zodiac Killer. And finally the Hunters-Point Naval Shipyard, San Francisco, located on 638 acres in the southeast corner of the city. At the start of World War II the Navy recognized the need for greatly increased naval shipbuilding and repair facilities in the San Francisco Bay Area, and in 1940 acquired the property from the private owners, naming it Hunters Point Naval Shipyard. The property became one of the major shipyards of the west coast. It was later renamed Treasure Island Naval Station Hunters Point Annex. During the 1940's, many workers moved into the area to work at this shipyard and other wartime related industries.
The key fissile components of the first atomic bomb were loaded onto the USS Indianapolis in July 1945 at Hunters Point for transfer to Tinian. After World War II and until 1969, the Hunters Point shipyard was the site of the Naval Radiological Defense Laboratory, the US military's largest facility for applied nuclear research. The yard was used after the war to decontaminate ships from Operation Crossroads. Because of all the testing, there is widespread radiological contamination of the site. After the war, with an influx of blue collar industry, the area remained a naval base and commercial shipyard. The Navy operated the yard until 1974, when it leased most of it to a commercial ship repair company. Extract from Wikipedia. 
The Navy ceased operations in 1974, the year the Zodiac mailed his final confirmed letter, the Exorcist Letter on January 29th 1974, in fact three further potential Zodiac letters were mailed that year, before the Zodiac Killer finally disappeared for good.

The Zodiac letters definitely switched emphasis after the Paul Stine murder on October 11th 1969, from the November 9th Bus Bomb Letter through to the Little List Letter on July 26th 1970, making references to the murder of two San Francisco police officers, Brian McDonnell on February 16th 1970 and Sgt Richard Radetich on June 19th 1970. Bombing was definitely on the agenda, although it was believed he never followed up in any of his proposed threats. 
The question remains, was irony his intention, if he had indeed selected Hunters Point as a location, somewhere he may have been familiar with or even worked. Even the surrounding areas were once known as 'Butchertown'.
In fact a bombing did occur in the January of 1970 at Hunters Point Police Station, highlighted in this KPIX eyewitness report and although with near certainty not the Zodiac Killer, it is possibly something he may have been aware of, had he worked in this region of San Francisco.
Did the Zodiac Killer live and work in San Francisco during the majority of his crimes, placing distance between himself and the first three attacks, before coming home to roost or did he live across the bay in the Vallejo/Benicia area and only used San Francisco as a mailing point for the most part. Who knows for sure.
But the 246 degrees from the center point of Mount Diablo runs directly across the Hunters-Point Naval Shipyard, in the Bayview District, notwithstanding the accuracy of the Little List diagram and the Mare Island Naval Shipyard has always courted some attention in Zodiac circles, on account of the proposed naval connection to our killer. Did he work at both facilities or even the third at Riverside. Was irony at work here or is the Hunters-Point connection just simply wide of the mark once more. 

SEE PART THREE -  http://www.zodiacciphers.com/zodiac-news/sfi-airport-hunters-point-part-three