Moon halos, or lunar halos, form when light refracts off of ice crystals in a thin layer of cirrus clouds. They’re sometimes ...

Hong Kong on Tuesday witnessed a rare natural phenomenon, a halo around the sun ... A small halo has an angular radius of 22 degrees, with a pale red lining or a purple aura at times.

The ring of light seen around the sun in areas of southern Louisiana today is a rare atmospheric phenomenon known as a sun halo. While taking a stroll, Acadiana Advocate photographer Leslie ...

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These crystals, shaped like miniature hexagonal columns less than 20 microns across, bend and reflect the moonlight at precise 22-degree angles ... In fact, meteorologists have documented these halos ...