Discussion
A lunar day is longer than a solar day because
Answer: D
Correct answer: the moon advances in its orbit while the Earth is rotating
A lunar day is the time between successive transits of the moon over the same meridian. In the twenty-four hours the Earth takes to turn once, the moon has moved about thirteen degrees along its orbit in the same direction, so the Earth must turn a little further to catch up. That extra rotation is what makes the lunar day the longer of the two.
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