Today's Image

A smile in the sky

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August 13, 2016

Image via Katerina Russo — Katerina Russo saw this circumzenithal arc in Casore del Monte, Tuscany, Italy on August 9, 2016.

Circumzenithal arcs have been described as an “upside down rainbow” or “a grin in the sky.” But circumzenithal arcs are not really rainbows. Instead, they’re caused by ice crystals in the upper atmosphere.

Find out more and see photos here.

Thanks for sharing your photo with us Katerina!

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August 13, 2016

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Today's Image

Eleanor Imster

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About the Author:

Eleanor Imster has helped write and edit EarthSky since 1995. She was an integral part of the award-winning EarthSky radio series almost since it began until it ended in 2013. She and her husband live in Tennessee, where they enjoy guitar playing and singing. They have 2 grown sons.