The sun is a huge star, and the moon is just a satellite of the earth. The diameter of the sun is several times that of the moon, and the size varies greatly.

The diameter of the sun is about 109 times that of the earth, and the diameter of the earth is about 3.66 times that of the moon, so the diameter of the sun is about 400 times that of the moon, or the difference between the two is similar to a basketball and a big sesame.

The diameter of the moon is about a quarter of that of the earth, and its mass is about one-eighty-first of that of the earth. Its surface is covered with craters formed by the impact of small celestial bodies. The average distance between the moon and the earth is about 384,400 kilometers, which is about 30 times the diameter of the earth.

Extended data

The moon revolves around the earth and rotates at the same time, with a period of 27.438+066 days, which happens to be a sidereal moon, so we can't see the back of the moon. This phenomenon, which we call "synchronous rotation" or "tidal locking", is almost a universal law in the satellite world of the solar system. It is generally believed that it is the result of long-term tidal action of satellites on the planet. The libration is a wonderful phenomenon, which enables us to see 59% of the moon. There are mainly the following reasons:

(1) In different parts of the elliptical orbit, the rotation speed does not match the revolution angular speed.

(2) the intersection of the white road and the equator.

The appearance of the moon moves half a degree per hour for the background starry sky, which is similar to the apparent diameter of the moon. Unlike other satellites, the orbital plane of the moon is closer to the ecliptic plane than the equatorial plane of the earth.