The moon performs three movements at once, ie the movement around its own axis is called the moon rotation; Movement around the earth is called a revolution; With the earth around the sun, the time it takes for the moon to surround its axis equals the time it takes to circle the earth. Thus, the moon's rotation period equals its revolutionary period. According to astrologers the period of the circulation of the month divided by two, namely the period of sideris month, ie the time it takes months to get back to the original place. That means the moon has circled the earth once, which is 27.3 days; The period of the synodic month, ie the time required for the appearance of the full moon one with the next full moon, which is 29.5 days. A synodistic month is also called a month komariyah.
The moon is Earth's only natural satellite, and is the 5th largest natural satellite in the Solar System. The moon does not have its own light source and the Moon's light actually comes from the reflection of the sun's light.
The average distance of Earth-Moon from center to center is 384.403 km, about 30 times the diameter of Earth. The diameter of the Moon is 3,474 km, [1] slightly smaller than a quarter of the Earth's diameter. This means that the volume of the Moon is only about 2 percent of Earth's volume and the gravitational pull on its surface is about 17 percent less than the Earth's gravitational pull. The moon circulates around the Earth once every 27.3 days (orbital period), and the periodic variation in the Earth-Moon-Sun system is responsible for the occurrence of repeated Moon phases every 29.5 d
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