22° halo

Pathway of light through a hexagonal prism in the optimal angle resulting in minimum deviation.

Path of the light from the clouds to the observer.

A 22° halo is a halo, one type of optical phenomenon, forming a circle with a radius of approximately 22° around the Sun, or occasionally the Moon (also called a moon ring or winter halo). It forms as the sun- 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.

单词	Lunar Halo
释义	Lunar Halo 英语例句库 When there is solar halo,it will rain;when there is lunar halo,it will blow. 日晕而雨,月晕而风。英语百科 22° 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 occasionally the Moon (also called a moon ring or winter halo). It forms as the sun- 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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Lunar Halo

22° halo