The moon is covered with exposed rocks and silhouettes of craters. The whole moon surface is covered with a layer of broken stone and floating soil. The surface of the moon seen from the earth has bright areas and dark gray parts. It turns out that the bright part is the mountains and highlands on the moon's surface, and the dark gray part is the plain on the moon's surface. In the process of the moon's movement around the earth, it also moves around the sun with the earth. That is to say, after the moon moves around the earth for a week, the space position returned to is not the original starting point. It can be seen that the moon is also involved in the movement of various systems. Like other celestial bodies, the moon is in perpetual motion. In addition to rising in the East and falling in the west, the moon moves 13 ° more than the star from the west to the East on average every day. Therefore, the rising time of the moon every day is about 50 minutes later than the previous day. The rise and fall of the moon in the East is the reflection of the earth's rotation, while the movement from the west to the East is the result of the moon's rotation around the earth. The moon's orbit around the earth is called a "stellar moon", with an average of 27 days, 7 hours, 43 minutes and 11 seconds. When the moon goes around the earth, it also rotates itself. The rotation period of the moon is equal to the revolution period, i.e. 1:1. The time of the moon around the earth is the rotation period.
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