Solar halo appears in the sky of Lhasa on September 2. Being an atmospheric optical phenomenon, it occurs when sunlight goes through cirrostratus and is refracted or reflected by ice crystals. Photo shows the prayer wheel of a believer and the solar halo in the sky.[Photo/ Chinanews.com]

Solar halo appears in the sky of Lhasa on September 2. Being an atmospheric optical phenomenon, it occurs when sunlight goes through cirrostratus and is refracted or reflected by ice crystals. A tourist is taking pictures of the solar halo wonder. [Photo/ Chinanews.com]