LAURENT LAVEDER / SCIENCE PHOTO LIBRARY LAURENT LAVEDER / SCIENCE PHOTO LIBRARY
Lunar halo. This atmospheric optical phenomenon is seen here around the Full Moon, and is caused by prismatic refraction of moonlight 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. Photographed in Brittany, France.
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