I am doing a project about the earth, the sun, and the moon. My question is why does the moon rotate around the earth?
But why does it go around the earth?I'm guessing that what Borek means is that from the point of view of someone at rest in the Solar System, the Earth and Moon orbit together around the sun, but their orbits wiggle slightly around each other because of their mutual gravitational pull. The orbit of the moon around the sun is always curved towards the sun, so from that point of view it would be difficult to see the moon as going around the earth.
However, from the point of view of the earth, the moon rotates about the earth. In fact, the earth and moon together orbit their common center of mass, but because the earth is so much heavier, that's approximately the same as the moon going round the earth.
The general answer is that because moon is passing fairly close to the earth, the earth's gravity pulls it round into a closed orbit, and the smoothing effect of tides over millions of years have made that orbit approximately circular and the moon's rotation to synchronize with the orbit so that it always presents approximately the same face.
That is a good point of distinction, and one not asked of the original poster.I thought you were aiming for the fact that the Moon revolves, with rotation being used for a single object about an axis.
But why does it go around the earth?