A 22° halo is an optical phenomenon that belongs to the family of ice-crystal halos. Its form is a ring with an apparent radius of approximately 22° around the Sun or Moon.
When visible around the Moon, it is called a moon ring or winter halo. It forms as direct sunlight or moonlight is refracted in millions of hexagonal ice crystals suspended in the atmosphere.
The halo appears large; its radius is roughly the length of an outstretched hand at arm’s length.
A 22° halo may be visible on as many as 100 days per year – much more frequently than rainbows.
:Wikipedia
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