The moon, commonly known as the moon, also known as the moon, also known as Taiyin, xuantu, Chanjuan and Wangshu in ancient China, is the only natural satellite on earth and the fifth largest satellite in the solar system. The following are some articles I brought to you. Why has the moon been cloudy, sunny, round and deficient since ancient times?, For your reference.
Why has the moon been cloudy and clear since ancient times?
The reason why we observe the moon is that the sun is reflected on the moon's surface when it is sunny or absent, so we find that the sun is reflected on the moon's surface when it is cloudy or absent. Sometimes eclipses also cause shadows.
Basic data of the moon
Track data
The average track radius is 384403 km;
Track eccentricity 0.0549;
Perigee distance: 363300 km;
Apogee distance: 405493 km;
The average revolution period is 27.32 days;
The average revolution speed is 1.023 km / S;
The inclination of the track varies between 28.58 ° and 18.28 °;
Photos of Apollo landing on the moon
Photos of Apollo landing on the moon (19)
Ascending node right ascension 125.08 °;
Perigee angle 318.15 °;
Medon 19 years;
The average distance between the moon and the earth is 384400 kilometers;
The retrograde period of intersection is 18.61 years;
Perigee cycle is 8.85 years;
346.6 days in eclipse year;
Saro cycle: 18 years, 10 / 11 days;
The average inclination between the orbit and the ecliptic is 4 °;
The average inclination between the lunar equator and the ecliptic is 1 °
The equatorial diameter is 3476.2 kilometers;
The diameter of the two poles is 3472.0 km;
Flatness 0.0012;
Surface area 3.79 × 10 ⁷ square kilometers;
Volume 2.199 × ten ¹ ⁰ cubic kilometers;
Quality 7.349 × ten ²² Kg;
The average density is 3.350 times that of water;
Equatorial gravitational acceleration 1.622 M / S ² (1 / 6 of the earth);
Escape speed: 2.4 km / S;
Moon
Moon (3)
The rotation cycle is 27 days, 7 hours, 43 minutes and 11.559 seconds (27.32 days, synchronous rotation);
Rotation speed 4.6267 M / S (lunar equator);
The inclination angle of the rotation axis varies between 3.60 ° and 6.69 °, and the intersection angle with the ecliptic is 1.5424 °;
Albedo 0.12;
Apparent magnitude at full moon - 13;
Surface temperature (T) - 233 ~ 123 ℃, with an average of 23 ℃;
Atmospheric pressure 1.3 × 10⁻ ¹ ⁰ kPa.