Cirrus cloud creates a halo around the Moon.

Cirrus cloud creates a halo around the Moon.

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Credit: FRANK ZULLO/SCIENCE PHOTO LIBRARY

Caption: Moon halo. High cirrus clouds create a circular halo around the moon. The halo occurs due to the refraction of light by ice crystals in the atmosphere. These crystals bend the light by 22 degrees towards the observer. The radius of a halo occupies 22 degrees of sky, though sometimes a secondary, fainter halo with a radius length of 46 degrees also forms. Cirrus cloud occur at high altitudes and are composed of tiny ice crystals.

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Keywords: atmospheric effect, cirrus, cirrus cloud, climate, cloud, effects, halo, meteorology, moon, moon halo, weather

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