Sun pillars appeared in Xilinhot City, North China's Inner Mongolia Autonomous Region, on Wednesday, December 30, 2015. A sun pillar is a vertical shaft of light extending upward or downward from the sun. Typically seen during sunrise or sunset, sun pillars are formed when sunlight reflects off the surfaces of falling ice crystals associated with thin, high-level clouds. (Photo by Imaginechina/Splash News)
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