Wednesday, May 19, 2010

Photo of an “Infralateral Arc”

Infralateral Arc, above Saint Louis, Missouri, USA

A rainbow-like “infralateral arc”, seen today over Saint Louis, is an optical phenomenon caused by sunlight being refracted through horizontal rod-shaped ice crystals high up in the sky.

2 comments:

  1. Wow! I've never heard of an infralateral arc.

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  2. Neither had I until I looked it up. Didn't know such a thing existed!

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