this is not my question , my question is below?

Question

The moon has phases,too. Why doesint that make us think the moon revolves around the sun,too,rather than around earth?

Answer 1

Because it gets between the Sun and us (solar eclipses); it never gets on the other side of the Sun (it would have to go there, at least once in a while, if it did orbit around the Sun instead of around earth).

Also, we have measured its actual distance from us with radar and lasers. It never goes more than 420,000 km from us. But the Sun is at 150,000,000 km from us.

Answer 2

The moon does orbit the sun, but along with the Earth.

While Earth does one orbit (1 year), the moon orbits the Earth 13 times (13 lunar months).

If the Moon orbited the sun separately, which is what I think you are suggesting, it would change visual size dramatically over time.

Just think of the moon as a satellite, which it is. The artificial satellites that are in orbit around the Earth, travel with the Earth as earth orbits the sun, obviously. The moon is no different, just a bit further away, and not artificial.

Answer 3

The fact that phases exist, in and of themselves, are not enough to determine the celestial mechanics of an object. One also need look at the frequency and sky location of said phases. Then one can see quite clearly that the object (moon) is in orbit around earth and not the sun.

That said, one can say that the gravitational center of the earth-moon system orbits the sun. Hope that helps.