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It rotates so that it has day & night.

The speed of that rotation is the remnant of the angular velocity imparted by the collision that formed the moon.

The fact that that interval is called 24 hours is purely arbitrary and is derived from some ancient civilization being fascinated by base 12 math and dividing day-light into 12 equal parts.

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Q: Why does earth have 24 hours in a day?
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