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Rainbow Dot


What is this? I saw it outside the plane window on some clouds. I have heard about rainbows shaped as a small circle, but never as a target like this one.

Update: After a grueling 31 seconds of research, I learned that these circular rainbows are apparently seen most often from planes. They are special cases of being able to see a large portion of the sky from the proper altitude. See here and here.

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