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"Sidereal" time is based on the stars.

The Earth actually turns 360 degrees in 23 hours, 56 minutes and a few seconds. So why do we say that a "day" is 24 hours?

Because in the 23 hours and 56 minutes that it takes the Earth to rotate once, the Earth has moved in its orbit so far that it takes another 4 minutes for the Earth to turn enough to point to the Sun again.

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16y ago

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