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| A sun halo appears behind a streetlight in Calcutta, India, Monday, July 5, 2010.A sun halo is an atmospheric optical phenomenon primarily associated with the reflection or refraction of sunlight by small ice crystals. 7月5日，印度，加尔各答：日晕景观。日晕是一种大气光学现象，是由于日、月光线通过云层时，受到冰晶的折射或反射而形成的。 |