nubbsgalore:this atmospheric phenomenon is known as a circumhorizontal arc, which occurs when the su
nubbsgalore:this atmospheric phenomenon is known as a circumhorizontal arc, which occurs when the sun is at least 58° above the horizon and the hexagonal ice crystals which form cirrus clouds become horizontally aligned. (photos x, x, x, x, x, x, x. see also: more circumhorizontal arcs, asperatus clouds, mammatus clouds, polar stratospheric clouds and cloud iridescence) -- source link
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