changchun

The tag changchun on WindowsForum.com covers a discussion about a rare atmospheric optical phenomenon observed over Changchun, the capital city of Jilin Province in northeast China. The thread describes an event where three suns appeared in the sky, with two smaller suns flanking the main sun and a bright light above, forming a rainbow-like aura. Experts cited in the thread explain this as a "phantom sun" caused by optical refraction through ice crystals in winter clouds. The content focuses on the scientific explanation of the phenomenon rather than Windows or technology topics.