On December 31, 2012, local time, in Douglas, Arizona, the American man Brandon Rios saw a rare "fire rainbow" in the sky when he was out with his father. His father took this group of pictures. The fire rainbow is actually called a horizontal arc around the ground. The probability of occurrence is very low. It is a rare intersection between the sun and some clouds at the correct time and position. The ice crystals in the clouds react with light to form different visible spectrum lights. The formation conditions are very harsh. The phenomenon is very rare, and the opportunity for people to shoot is also rare.
At noon on July 16, 2014, a young sunset rider in Jingzhou shot a horizontal arc around the horizon while riding the Qinghai-Tibet line through the Hoh Xil no man’s land. The ring occurred on the plateau (especially the Qinghai-Tibet line, the Xin-Tibet line, which has a high average altitude, arid, and vast plateau). The horizon arc seems to be more likely, and rainbows are more common.
At about 11:40 noon on June 8, 2016, a colored airplane cloud appeared over Chengdu, which lasted more than 20 minutes. This is a part of a horizontal arc around the ground that appeared on the trail of the airplane.
On February 22, 2017, a rare “fire rainbow” appeared in Singapore and was mistaken for UFO. A rare "fire rainbow" in the sky lasted about 15 minutes in the sky. The fire rainbow is also called the horizontal arc around the ground. The probability of occurrence is very low. It is a rare intersection between the sun and some clouds at a specific time and location. The ice crystals in the clouds reflect light to form different visible spectrum lights. The conditions for the formation of this phenomenon are very harsh, and because this phenomenon is very rare, the opportunity for people to shoot is also rare.
At noon on July 19, 2020, an arc around the horizon appeared in the sky in Changping, Beijing.