22° halo
Atmospheric optical phenomenon / From Wikipedia, the free encyclopedia
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"Moon ring" redirects here. For other uses, see Rings Around the Moon (disambiguation).
A 22° halo is an atmospheric optical phenomenon that consists of a halo with an apparent radius of approximately 22° around the Sun or Moon. Around the Sun, it may also be called a sun halo.[1] Around the Moon, it is also known as a moon ring, storm ring, or winter halo. It forms as sunlight or moonlight is refracted by millions of hexagonal ice crystals suspended in the atmosphere.[2] Its radius, as viewed from Earth, is roughly the length of an outstretched hand at arm's length.[3]