A beautiful and colorful halo — a 22 degree ring — as seen on the island of Lanzarote in the Canary Islands, taken by ‘Astrohans” (a.k.a. Hans Schremmer) on Flickr. Hans posted that circumhorizontal arc is also visible, and that the photo was taken on May 8, 2010 in Playa Blanca, using a Canon EOS 400D Digital.
Halos form when light from the Sun or Moon is refracted by ice crystals associated with thin, high-level clouds (like cirrostratus clouds). A 22 degree halo is a ring of light 22 degrees from the Sun (or Moon) and is the most common type of halo observed.
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