Okay, someone really needs to reprint Isaac Asimov’s excellent essay, “The Bridge of the Gods” which is all about light and rainbows. I’ve been seeing stuff all over about remarkable “double-rainbows” as if this is a new or even a rare phenomenon, but as Asimov explains in his essay, there is a very good explanation not only for the formation of a double-rainbow, but the geometry behind it.
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