22-degree halo around the Moon. Science Photo Library

22-degree halo around the Moon. Science Photo Library

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22-degree halo around the Moon

Halo around the Moon. This is the common 22-degree halo, so called as its diameter extends across 22 arc-degrees of the sky. It is caused by prismatic refraction through randomly-oriented hexagonal ice crystals in the atmosphere. Although all of the spectral colours are produced, only the reddish tint of the inner edge of the ring may usually be seen.. Stunning Photo Gifts From Science Photo Library

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