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There's a halo in the sky! - KVOA | KVOA.com | Tucson, Arizona

There's a halo in the sky!

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TUCSON - Some very observant KVOA viewers captured atmospheric awesomeness on Sunday.

(Image courtesy: Shane Gillies)

Every so often, Southern Arizona is treated to a huge ring surrounding the sun or moon. So what causes it? Let's explore the world of optics. (I promise to keep it simple)

(Image courtesy: University of Illinois)

Hexagonal ice crystals are typically found in high level clouds like cirrus. These ice crystals refract sunlight or moonlight twice, netting a 22° shift from its original path. The net result is the brilliant 22° halo that catches the eye.

(Image courtesy: Jordan Pegram)

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