A circumzenithal arc, an optical phenomenon that looks like an inverted rainbow, appeared in the sky over Xuhui district around 8:20 am Monday morning. Some of the people who spotted the phenomenon ...

Thanks to Sue of Campbellsburg, IN for sending in this pic. The one at the top of this post is the close up of the circumzenithal arc and the one below is the whole picture. The sun was at the bottom.

GRAND RAPIDS, Mich. (WOOD) — It can stop you in your tracks if you spot it — a rare upside-down rainbow! This kind of rainbow formation is called a circumzenithal arc (CZA), and technically, it isn’t ...

NASA has shared a stunning image of an inverted rainbow that looks like a colorful smile in the sky. The scientific name for this phenomenon is a ‘circumzenithal arc’. The picture Nasa shared was ...

I wanted to share this photo with you. The clouds were absolutely beautiful and after taking a few pictures, I looked up and noticed the rainbow colors within the clouds, which added to how stunning ...