Solar halo. This atmospheric optical phenomenon is seen here around the Sun, and is caused by prismatic refraction of sunlight through randomly-oriented hexagonal ice crystals in the atmosphere. This is the common 22-degree halo, so called as its diameter extends across 22 arc-degrees of the sky. The beginnings of a sundog (twinned patches of brighter areas either side of the Sun) are also visible. Photographed in Brittany, France.
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TOP06660252
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達志影像
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RM
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