Moons revolution around the earth

The Moon's revolution about the Earth, its orbit, takes approximately 28 days. This time period varies between '27' & '29' because of the Moon's slightly elliptical orbit about the Earth, and the fact that that orbit is angled at about 5 degrees, to the plane of the Earth's orbit about the Sun.

NB THe Moon's rotation is also very slow. It takes the Moon approximately 28 days also to make one rotation on its axis. This results in the Earth being able to only to see 61% of the lunar surface, throughout history. It was only when astronauts and spacesjips went to the Moon that the other side was seen.