20 17 what happened in the sky in Beijing?

This is a cloud color formed by natural reasons, but because of the refraction of light, people's vision is wrong, so they will mistake the cloud for Guanyin Bodhisattva.

There are clouds of different colors in the sky, some as white as floc, some as black, some as gray, some as red and purple. Here, the thickness of the cloud determines the color. The thickness of various clouds we see varies greatly, from 7-8 kilometers thick to only tens of meters thin.

There are many kinds of layered clouds, isolated cumulus clouds and fluctuating clouds. Thick layered clouds, or cumulonimbus clouds, the light from the sun and the moon is difficult to transmit, and the clouds look black; Slightly thinner layered clouds and wave clouds look gray, especially in wave clouds, and the edges of the clouds are grayer; Very thin clouds, light can easily penetrate, especially thin clouds made of ice crystals. Clouds are especially bright and silky in the sun. Even if there are such layered clouds in the sky, objects on the ground will still reflect shadows under the illumination of the sun and the moon.

Sometimes the clouds are so thin that you can hardly see them, but as long as you find one or several big rings near the sun and the moon, you can still tell that there are clouds. This cloud is called "cirrostratus with a thin curtain". Isolated cumulus clouds, because the clouds are thick, almost all the light is reflected to the sunny side, so it looks white; On the backlight side and its bottom, the light is not easily transmitted and looks gray and black.

At sunrise and sunset, because sunlight is oblique and passes through the thick atmosphere, molecules, water vapor and impurities in the air are scattered a lot in the short-wave part of light; However, the long-wave part of red orange is not scattered much, so when it hits the lower atmosphere, long-wave light, especially red light, accounts for an absolute majority. At this time, not only the sky in the direction of sunrise and sunset is red, but also the bottom and edge of the cloud illuminated by it become red. Because clouds are composed of water droplets, ice crystals and a mixture of the two, when the sun and the moon pass by, they will also create various beautiful light rings or rainbows.

It is precisely because of the different factors of cloud formation that the color and shape of clouds are very different. Because of the light, the shapes of clouds in the sky are different, which brings people a visual impact.