What's the use of artificial moon?

The principle of artificial moon is consistent with the reflection of the sun's light by the moon. The satellite focuses the sun's light in a certain range through a special huge reflector. The idea of artificial moon originated from the idea of a French artist: "Hang a necklace made of mirrors over the earth so that they can reflect sunlight to the streets of Paris all year round." Some people worry that artificially reflecting sunlight from space to the ground will affect the daily life and astronomical observation on the ground.

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.