A large number of tiny hexagonal ice crystals are distributed in the very cold and cirrus clouds. When these ice crystals are near the sunrise or sunset, they will refract the sunlight like a prism to form a "halo" around the sun. When the ice crystals sink, they will be neatly arranged vertically, so that the sunlight will be refracted about 22 ° to the left and right along the horizontal direction. The three lines of light from the icicle will be emitted into people's eyes. The middle line of solar light is directly emitted from the sun in the middle, which is the real Taiyang; The next two rays are refracted by the sunlight through the hexagonal crystal column. In this way, in people's eyes, there are two other suns on both sides of the middle real sun, which are actually virtual images of the sun.

The magic sun is an optical phenomenon of the atmosphere. In the translucent thin cloud in the sky, there are many hexagonal columnar ice crystals floating in the air. Occasionally, they are arranged neatly in the air. When sunlight shines on these hexagonal icicles, very regular refraction will occur. When many ice crystals are near the sunrise or sunset, light enters from one side of the icicle and exits from the other two sides, resulting in reflection and refraction, resulting in multiple suns, which are actually virtual images of the sun.