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Sunday, April 6, 2008
25 Hours A Day? - Perhaps, because Earth is Decelerating
Days are gradually growing longer. To the layman this means that in the northern hemisphere days are longer in summer than they are in winter. But geoscientists interpret this phrase as follows: they found that days grow longer not only in spring time. Days may have 25 hours in near future due to Earth’s decelerating
When prehistoric proto-animals inhabited Earth 530 million years ago, there were 21 hours in a day. For dinosaurs who lived 100 million years ago days alternated each other every 23 hours.
About 530 million years ago Earth rotated on its axis faster than it does today, but it rotated about the sun at a steady speed. At that time the year had the same amount of hours as it has today, but there were 420 days in it. According to trustworthy sources, throughout the history of mankind Earth’s rotation has been reducing its speed, Richard Stephenson from Durham University, UK, says for the Journal for the History of Astronomy.
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When prehistoric proto-animals inhabited Earth 530 million years ago, there were 21 hours in a day. For dinosaurs who lived 100 million years ago days alternated each other every 23 hours.
About 530 million years ago Earth rotated on its axis faster than it does today, but it rotated about the sun at a steady speed. At that time the year had the same amount of hours as it has today, but there were 420 days in it. According to trustworthy sources, throughout the history of mankind Earth’s rotation has been reducing its speed, Richard Stephenson from Durham University, UK, says for the Journal for the History of Astronomy.
More from here
Labels: Geo-Sciences, Sciences
PermaLink - 25 Hours A Day? - Perhaps, because Earth is Decelerating posted by Ecacofonix : 10:07 PM
