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http://www.space.com/scienceastronomy/top_10_cool_moon_facts-2.html<br /><br />says that the moon is subjecting Earth to a decaying rotational spin in the order of 1.5 milliseconds per 100 years. <br /><br />There is some corroborating evidence in that there has been at least one study (which I am unfortunately unable to reference at this time) that says the natural daily cycle of both mice and humans is 24 hours and 40 minutes. This natural body cycle is controlled by some brain function that is common to both mice and humans. <br /><br />I believe no one has ever understood why it is 24 hours and 40 minutes and not closer to 24 hours and zero minutes (which is of course is the current period of rotation of the earth on its axis of spin) until now !<br /><br />If the Earth is slowing by 1.5 milliseconds per century then by calculation:<br />40 minutes / 0.0015 seconds*100 = 160 million years, that is 160 million years ago the earth had a rotation of 24 hours and 40 minutes.<br /><br />I am suggesting here for the very first time that mice and humans had a common ancestor at this time (160 million years ago) and also that this is the time in mammals evolution that the part of the brain that governs daily rhythms was encoded into our common ancestors dna.<br /><br />I have little knowledge in the time-line of mammals' evolution, so I hope someone of credentials or suitable background can use this as supporting evidence in their field or forward this to those who may utilise the connection that I have made. I also hope that linking these 2 facets of information helps those in the Astronomy Field, particularly those who have forwarded the idea that the Moon is degrading Earth's rotational spin to the degree listed.<br /><br />Regards: Kevin Slattery