Let us look at the notable dates of Zodiac events from the Melvin Belli Letter to just prior to his mailing of the 'My Name is..Letter. The Belli Letter was mailed on the anniversary of the Lake Herman Road murders on the 20th, the Hood/Garcia murders were on the 21st and the highly debated Modesto abduction of Kathleen Johns took place on the 22nd. The key numbers to remember here are 20,21 and 22, then came the 'My Name is..Letter'. Within this letter the Zodiac gave us a 13 Symbol Cipher containing 4 Zodiac signs, but apparent was the highlighted three 8's or three Taurus symbols circled.
An astrological chart shows a full moon denoted as a circle and the 'My Name is..Letter' was mailed on April 20th 1970 to the San Francisco Chronicle, so let us look at an astrological chart of San Francisco on this date, bearing in mind that a full moon is regarded a full moon either side of it waxing and waning above 95% illumination. In astrology the Zodiac sign of Aries runs on average from March 21st to April 19th and Taurus takes over on April 20th ( the date this letter was mailed ) until May 20th. There are four full moons in April (shown here on the astrological chart), one falls in Aries and three fall in Taurus, the exact configuration on the 13 Symbol Cipher. The most important thing here though is the full moon circled Taurus symbols. They fall on the 20th, 21st and 22nd, exactly the same dates as the Melvin Belli Letter, the Hood and Garcia murders and the Modesto abduction in the run up to this letter and the 21st is the center point of the cipher as a whole. Take a look here for a visual representation.
This attack came approximately four months after Hood and Garcia, who were murdered on Saturday February 21st 1970, 16 miles west of these attacks. Both the Melvin Belli Letter and Shadwick/Dolan murders were anniversaries of the Zodiac Killer's first two crimes at Lake Herman Road and Blue Rock Springs. But this may be the tip of the iceberg regarding dates employed by the Zodiac Killer. Lake Herman Road, Blue Rock Springs, Lake Beryessa, Presidio Heights, the Hood/Garcia murders, the Shadwick/Dolan murders and the likely murder of Donna Lass, all had one date in common, but that is another story. Zodiac Ciphers-Murder In The First.