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sidereal time
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How Long Is a Day Really? The Science Behind Time’s Most Basic Unit
A clock ticks. A calendar flips. A sunrise signals the start of another cycle. We take it for granted: a day is 24 hours. But how long is a day, truly? The...
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A clock ticks. A calendar flips. A sunrise signals the start of another cycle. We take it for granted: a day is 24 hours. But how long is a day, truly? The...