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The days used to be shorter millions of years ago, and it's because of the Moon.
These Science Facts Will Blow Your Mind
Wikimedia Commons / Jessie Eastland

Because of the changing distance between our planet and the Moon, the Earth's rotation is slowing. It used to spin much faster, which caused days to be shorter. There were probably about 385 days in a year back then, with each day lasting less than 23 hours. And yes, there's geological evidence to back that up.