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smellykat
It lasts 29 1/2 days.
-the sidereal month- is the true period of the moon's revolution around Earth. It lasts 27 1/3 days.
-the difference of 2 days between the synodic and sidereal cycles is due to the Earth- moon system also moving in an orbit around the sun.

Answer:

27 days

Explanation:

Earth has only one natural satellite-the moon. The moon is about one-fourth the Earth's size. Moon rotates about its own axis as well as revolves about the Earth. Its revolution period around Earth is 27.32 days ([tex]27 \frac{1}{3}[/tex] days) where as its rotation period is 27 days. Due to this synchronization of the two periods, only one side of the moon is always visible to us.

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