New Delhi: Residents in Weichang Manchu and Mongol autonomous county, Chengde city, Hebei province, witnessed a fantastic view of three suns in the sky on Friday morning. The phenomenon also appeared in several other regions of Inner Mongolia and Hebei province on Friday. For two hours, the city of Chengde was lit up by a rare illusion known as "triple suns". People rushed outdoors to take pictures and video of the two additional "suns" that appeared in the sky, surrounded by rainbow-like halos. In some areas of the city, in the Inner Mongolia region of northern China, residents reported seeing five suns shining. The illusion - a legitimate astronomical phenomenon - is also known as phantom sun or ice halo, according to the Chengde Meteorological Bureau. It appears when ice crystals create high clouds in the air around 6,000 metres above ground, and produce reflected sunlight. "The cause of such phenomenon lies in the existence of the stratocirrus consisting of ice crystals in the air, and sunlight is reflected by the crystals into such an illusion," said Chang Xin, a forecaster at Chifeng Meteorological Bureau.