Fact Snacks!

alexanders-band-is-the-dark-strip-of-sky-in

“Alexander’s Band” is the dark strip of sky in between double rainbows. If light is reflected twice out of a single rain drop, it causes mirror image rainbows. When this happens, light only reflects below the bottom bow and above the top bow, making the sky appear darker in the middle. Source Source 2 Source 3


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