22-degree halo around the Moon

22-degree halo around the Moon

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Credit: PEKKA PARVIAINEN/SCIENCE PHOTO LIBRARY

Caption: 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.

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Keywords: 22 degree, 22 degree halo, atmosphere, atmospheric effect, circle circles, climate, effects, fish-eye lens, halo, ice, meteorology, moon, photo, refraction, round shape, rounded circular, weather

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