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Epoch-ending meteorite impacts may explain mis-match between solar day and human circadian day

Author: 
William W. McDaniel
Subject Area: 
Life Sciences
Abstract: 

The circadian cycle of humans and other mammals is close to one hour longer than the 24 hour period from sunrise to sunrise. The meteorite strike(s) that occurred at the end of the Cretaceous era involved at least one very large body that struck our planet obliquely, apparently moving in the direction that it would have to have done to impart momentum to the rotation of Earth and decrease the period of the day. Working from current modelsfor estimating the mass of meteorites from crater dimensions, we found the largest estimate of the Chicxulub impactor to have been still three orders of magnitude too small to account for the difference between the solar day and the circadian cycle. The recently discovered Shiva crater in the floor of the Indian Ocean near Mumbai is much larger at 600km diameter. The orientation of the crater suggests its impact was also oblique, towards the northeast, and possibly as much as one half the mass necessary to have imparted momentum to the rotation of the Earth, and thus reduced the duration of the day by one hour. There were also cosmic impacts that coincided with the end-Permian extinction., and at least one of them was clearly moving eastward

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