According to the myth of "Houyi shoots the sun" in ancient China, there are 10 suns in the sky. Although this is only a beautiful legend, there are many "suns" in the sky, which are recorded in history books. Legend has it that during the mutiny in Chen Qiao, Zhao Kuangyin, two suns appeared in the sky. Zhao Kuangyin launched a mutiny with this celestial phenomenon, adding a yellow robe to his body, which laid a century-old foundation for the Song Dynasty. 1933 At 9: 45 a.m. on August 24th, a sun appeared around Emei Mountain in Sichuan Province, China, which was a great surprise. 1934 65438+1October 22nd and 23rd, 165438+ From 0: 00 am to 4: 00 pm, the three wonders of the sun side by side in the sky also appeared in the ancient city of Xi 'an. 1965 On the evening of May 7 16: 25 and at 6: 00 am on June 2, three suns appeared side by side over Panchengji, Pukou, Nanjing. There is no doubt that there is only one sun in the solar system, so what is this phenomenon? It turns out that this is caused by atmospheric changes. Six kilometers above the ground? 9? Altitude 18km, and the temperature is very low all the year round. There are a lot of ice crystals with different shapes, which roll up and down with the atmosphere. When sunlight hits these small ice crystals, they refract sunlight like glass prisms or reflect sunlight like mirrors. Because the sunlight is refracted, the light is emitted from different angles, so a beautiful light ring-halo is formed around the solar halo. /kloc-in the summer of 0/970, a scholar in Petersburg saw such a spectacle: "There are two iridescent apertures around the sun. One big and one small. Above and below them, there is a shiny semi-arc, just like two wide corners connected with the aperture up and down. A white band of light parallel to the horizon passes between the sun and the rainbow aperture and surrounds the blue sky. There are two dazzling magic days where the white light belt passes through the small aperture. The side facing away from the sun is red, and the side facing away from the sun is pulling a long luminous tail. You can see three identical points facing the sun on the white light belt. On the small ring above the sun, the sixth bright spot kept flashing. This complex halo phenomenon lasted for five hours in the sky. " The principle of optics has caused this amazing natural phenomenon. In fact, there is only one real sun, and the rest are illusory shadows.