The color of the moon is also related to which side of the earth faces the moon. If most of the ocean faces the moon, then the moon is blue and white, and if most of the land faces the moon, then the moon is yellow. The color of the moon is influenced by atmospheric transparency (including the selective extinction of floating dust and clouds). Blue light with short wavelength is easily absorbed or scattered by these suspended substances, thus making the moonlight appear "red". When the transparency is poor, the rising moon is even orange red.
The original color of the moon surface is gray-black, and the characteristics of reflecting sunlight are close to neutral. In the revolution of the moon around the earth, the orbit is far and near. It looks bigger when it is close, which means it is brighter. Instead, it looks smaller and darker. In addition, the humidity and thickness of the atmosphere also affect the refraction of light.
When the moon reflects sunlight through the earth's atmosphere, some blue light is scattered into the night sky by water vapor molecules in the atmosphere, and the rest of the light reaching the human eye looks a little yellow.
The moon is usually yellow, mostly when it appears on the horizon. You can refer to the pattern of the sun. The sun will be yellow at sunrise and sunset, but it won't be yellow at noon, and neither will the moon. This is mainly related to the atmosphere. When the moon is directly above, the distance of light passing through the atmosphere is the shortest and its absorption of light is limited. But when the moon is on the horizon, the distance of light passing through the atmosphere is the longest, so some wavelengths of light will be consumed by the atmosphere, making the moon appear different colors. ?
It depends on the local air quality or the thickness of clouds. If the local air is clean and there are few clouds, the moon will be bright and bright. On the other hand, if the air quality is poor or the clouds are thick, the moon will turn yellow, and it will be invisible or even invisible. In addition, when sunlight passes through the atmosphere, it will also be refracted, which may also affect the brightness and color of the moon. ?
The same is true of the red moon during the total lunar eclipse. The sun's rays can't reach the surface of the moon, but they can be refracted through the earth's atmosphere. At the same time, sunlight is a mixture of seven colors: red, orange, yellow, green, blue, blue and purple. This arrangement order is arranged according to the wavelength from long to short, that is to say, red light has the longest wavelength and is least susceptible to the scattering of tiny molecules in the atmosphere, so it can often penetrate from the atmosphere and reach the surface of the moon.
In this way, you can often see the "red moon" during the total solar eclipse. There is only one reason, but the actual situation is ever-changing. Sometimes we will see "grey moon" or "black moon", which mainly depends on the clarity of the atmosphere, that is, the degree of light transmission.