The Moon does not make its own light —”moonlight” is actually reflected sunlight. At any moment, half of the Moon is brightly sunlit (this is the day side). The other half is in the dark (this is the night side). Throughout the month, as the Moon rotates and orbits, day and night occur on different parts of its surface, just like on Earth. Unlike our planet, though, the Moon takes a whole month to complete one rotation. This means that lunar day and night are each about two Earth weeks long.
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