Question

The moon’s period of revolution is 27 1/3 days, and its period of rotation about its axis is _____.

Answer 1

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 ($27 \frac{1}{3}$ 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.

Answer 2

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.