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Have a love of the sky, and know of a lot of atmospheric phenomena, but never heard of this. Awesome.

The website Scientific Origin reveals that the so-called “fire rainbows” are “rare and geographically limited” because of three factors. First, the sun’s angle must be at least 58 degrees above the horizon. Next, the cirrus clouds need hexagonal, plate-like ice crystals to refract the light. Last, the ice crystals should be horizontally aligned within the cirrus clouds to get the distinctive blaze shape.
