01-22-16 – Moon Halo


A 22° halo is a halo, one type of optical phenomenon, forming a circle with a radius of approximately 22° around the Sun or Moon (in which case it is also called a moon ring or winter halo). It forms as the sunlight or moonlight is refracted in millions of hexagonal ice crystals suspended in the atmosphere. The halo is large; the radius is roughly the size 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.

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