The Zodiac hibernation

Discussion of Zodiac Victims David Faraday & Betty Lou Jensen

Re: The Zodiac hibernation

Postby Pettibon Junction » Wed Jul 15, 2015 7:02 am

Perhaps he suffered from seasonal-affective disorder and simply couldn't motivate himself to engage much in "external" activities during the winter months.
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Re: The Zodiac hibernation

Postby Nick, no Nora » Thu Jul 23, 2015 12:32 am

A semi-related question .... does anyone know when Berkeley or other area schools ended their semester in Dec. 1968?
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Re: The Zodiac hibernation

Postby Norse » Thu Jul 23, 2015 4:40 pm

Nick, no Nora wrote:A semi-related question .... does anyone know when Berkeley or other area schools ended their semester in Dec. 1968?


At a guess: Around the 20th.

I found an old UC Davis calendar from the mid-60s and the last order of business there was the 20th. Depends how you define it, though.

When would the actual courses taken by Student NN have ended?

Guess: Between the 15th and the 20th.
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Re: The Zodiac hibernation

Postby TheMist » Sun Jan 07, 2018 6:36 pm

This is an extremely interesting observation. Just a quick note that Donna Lass disappears in September 1970 and the peek through the pines letter shows up in March 1971, fitting the pattern.
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Re: The Zodiac hibernation

Postby TheMist » Sun Jan 07, 2018 9:06 pm

ZEvents.jpg


There might be something to this. The distribution per month of the canonical vs non-canonical attacks and letters is different. The canonical events distribution per month of the year is peakier and the non-canonical event distribution is flatter. The canonical distribution shows increased activity in March-April, July, and October, with periods of low or no activity in January-February and May. The only "canonical" event in January is the 1974 Exorcist letter, which I have never liked very much.

Of course, the sample size of non-canonical events is smaller, which may affect the analysis, but one would then expect it to show more variation than the larger canonical set, rather than less.

Interestingly, a canonical plus list which adds Santa Barbara, the CJB related events, the Donna Lass events, and the Radetich murder to the canonical list reinforces the pattern. We know already that there is a strong preference for Z to be active on weekends, at least for attacks. It may be that Z also had strong seasonal preferences.

ZEvents2.jpg


Canonical events:

Lake Herman Road murders
Blue Rock Springs murders
408 Cipher letters
This is the Zodiac speaking letter
Lake Berryessa murders
Paul Stine murder
Stine shirt letter 1
340 Cipher letter
Fouke Letter
Stine shirt letter 2
My name is letter
Blast letter
Zodiac Buttons letter
Kathleen Johns letter
Mikado letter
Halloween card
Riverside letter
Peek through the pines letter
Exorcist letter

Non-Canonical events

Santa Barbara murders
Cheri Jo Bates murder
Cheri Jo Bates confession letter
Bates had to die letter
Kathleen Johns attack
Radetich murder
Donna Lass disappearance
13th letter
You are next letter
SLA letter
Badlands letter
Red Phantom letter
It's me letter
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