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Old 03 Oct 17, 13:02
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Quote:
Originally Posted by MarkV View Post
Merely a coincidence the Earth's rotational period has been slowly changing over time (and will continue to do so albeit very very gradually) and the length of day was different when our distant ancestor oozed out of the primordial soup and evolution started selecting out the ability to go with the light dark cycle. The switch from night to day resets us back to 24 hours each morning but time down a mine or on shift work can disrupt this
The Solar day has been slowly getting longer over time, so that mans natural clock of c25hrs would not be related to this phenomenon. The other obvious suspect is the Lunar day which mirrors mans natural cycle. I suspect this is a throwback to when our ancestors were coastal dwellers. Yes, I am slightly seduced by the Aquatic ape hypothesis (https://en.wikipedia.org/wiki/Aquatic_ape_hypothesis) and totally understand if most think it is bunk, as it is highly contentious .
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