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A lunar halo is caused by the refraction, reflection, and dispersion of light through ice particles suspended within thin, wispy, high altitude cirrus or cirrostratus clouds. As light passes through these hexagon-shaped ice crystals it is bent at a 22 degree angle, creating a halo 22 degrees in radius (or 44 degrees in diameter). A double halo, sometimes with spokes, may be seen on rare occasions when light reflects off water or ice.
The prism effect of light passing through these six-sided ice crystals separates the light into its various colors, resulting in a halo tinged with very pale rainbow colors with red on the inside and blue on the outside. The phenomenon of a lunar halo is similar to a rainbow produced by sunlight and rain falling between your eye and the sun.
Weather lore says a lunar halo is the precursor of impending unsettled weather, especially during the winter months. This is often proved true, as cirrus and cirrostratus clouds generally precede rain and storm systems.
Originally posted by iwannaseethisshipgodown
hey man i'm seeing it too right over my house. SE England its getting more prominant in the sky now looks cool.