A day at the beach

A July 4 day at the beach, with a circumhorizon arc overhead.

Photo taken July 4, 2017 by Joan Helle-Fasolo at Ship Bottom, New Jersey.

Editor’s Note: When EarthSky first published this image, we misidentified it as a photo of iridescent clouds. In fact, it’s a circumhorizon arc. Mistaking one for the other is easy, but here are some tricks that can help. Our thanks to alert reader George Preoteasa for pointing out the mistake … and apologizes for any confusion!

Read more: What causes rainbow colors in clouds?

Read more: Iridescent cloud? Or circumhorizon arc?

Deborah Byrd