Path: utzoo!attcan!uunet!zephyr.ens.tek.com!videovax!chrish
From: chrish@videovax.tv.tek.com (h)
Newsgroups: sci.bio
Subject: Re: 25 hr day
Keywords: 25 hr day
Message-ID: <5913@videovax.tv.tek.com>
Date: 19 Jul 90 20:39:13 GMT
References: <33843@ut-emx.UUCP> <1990Jul12.212246.19272@cbnewsl.att.com> <58173@bbn.BBN.COM>
Reply-To: chrish@videovax.tv.tek.com (h)
Organization: Tektronix TV Measurement Systems, Beaverton OR
Lines: 7

If the 25hr day needed to be longer than the 24hr earth cycle so that
the sync pulse of the sunrise/sunset would be short enough to act as
the necessary positive feedback mechanism why wouldn't it vary with
the seasons?  The sync pulses of sunset/sunrise come so much closer
together in winter than in summer.  If the conjecture is that man 
needed to stay awake longer for awareness of nocturnal predators, the
same question applies.  Why wouldn't it vary with the seasons?