Circumhorizontal arc
Taken by Aaron Watson on July 28, 2025 @
West Elk Mountains, Colorado
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Camera Used: Apple iPhone SE (1st generation)
Exposure Time: 1/4000
Aperture: f/2.2
ISO: 25
Date Taken: 2025:07:28 14:00:38
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Details:
Out on a bike ride I noticed a strong horizontal rainbow above the mountains. It looked like a sundog, but it was a double sundog, because this horizontal band of color was well below the sun (46 degrees or so) and there was a full halo at 22 degrees. I think it is called a circumhorizontal arc. It was quite bright and easy to see, and lasted for a good 15 - 20 minutes. Surprising to see this on a hot summer day with a surface temp around 100 deg F.
Photographer's website:
https://www.skies-alive.com/gallery
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