Here are another couple of videos I just found on youtube of a full circle rainbow from the air.
And a couple of links with more images and videos of full circle rainbows:
Where's the pot of gold? Complete rainbow captured above Niagara Falls
Can you see a whole circle rainbow? | EarthSky.org
A Full Circle Rainbow over Australia APOD: 2014 September 30
You can sometimes see full circle rainbows on the ground also, e.g. in a fountain.
About the Author
Robert Walker
Writer of articles on Mars and Space issues - Software Developer of Tune Smithy, Bounce Metronome etc.Studied at Wolfson College, Oxford
Lives in Isle of Mull
4.8m answer views110.3k this month
Top Writer2017, 2016, and 2015
Published WriterHuffPost, Slate, and 4 moreHuffPost, Slate, Forbes, Newsweek, Business Insider, and Science 2.0