Did the length of an Earth day differ significantly during different epochs of Earth's history?
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It's currently roughly 24 hours, but has this always been the case? Could the Earth have had say, 18 or 30 hour days during past geological eras?
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Answer:
Earth's rotation is gradually slowing down. Primitive animals and plants lived during a 21 hr day.
Chris Rentsch at Quora Visit the source
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