Traditional Culture Encyclopedia - The 24 Solar Terms - Why: 1d=24h? (Why does 1 day have 24 hours? )
Why: 1d=24h? (Why does 1 day have 24 hours? )
No, the earth's rotation is not 24 hours, but 24 hours is the result of the earth's rotation and revolution!
The earth turns once a day.
The time for the earth to rotate once (360 degrees) is 23 hours, 56 minutes and 04 seconds, which is a little less than what we usually say "one day and one night is 24 hours". Humans themselves can't feel the rotation of the earth, so they are used to calling sunrise and sunset a day before sunrise.
The ancient Egyptians divided the day into 24 hours. Every hour is divided into 60 minutes and every minute is divided into 60 seconds. So there are 24×60=86400 seconds in a day. These hours, minutes and seconds have become time units.
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