Sandbow or Rainbow?

Stephen R. Wilk

Water droplets and ice crystals create beautiful rainbows that paint the sky. Can other natural particles produce similar arcs of color?



In the morning there was khamsin [a sandstorm] and we saw a sandbow. It was on a level with the sun, and not opposite it as in rainbows, but about 30° from it; not the shape of a rainbow, but of a nebula; all the colours perfect. It had a most singular effect; it was about midday, so that the top of the pillar of sand must have reached that height.

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