In the writings of frustrated people, the moon has a symbol of frustration. The quiet mood of the moon has created a quiet and beautiful aesthetic mood and aroused the ethereal feelings of many frustrated literati. The moon hanging high in the sky has also aroused people's philosophical thinking, and the moon has become an eternal symbol.
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The moon itself does not shine, but reflects sunlight. The brightness of the moon varies with the angular distance between the sun and the moon and the distance between the earth and the moon. The brightness at the full moon is more than ten times higher than that at the top and bottom chords.
The average brightness of the moon is 1/465000 of the brightness of the sun, and the brightness varies from 1/630000 to 1/375000. The average brightness at the full moon is-12.7, etc.
Its average illumination to the earth is 0.22 lux, which is equivalent to the illumination of 100 watt electric lamp at a distance of 2 1 meter. The surface of the moon is not a good reflector, and its average albedo is only 9%, and the other 9 1% is absorbed by the moon. The albedo of Guangdong Sea is even lower, about 7%. The albedo of the lunar highlands and craters is 17%, and it seems that the mountains are brighter than the moon sea.
The distance from the moon to the earth is about 1/400 of the distance from the earth to the sun, so the moon is as big as the earth to the sun.