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What is the name of the dark region of the sky that lies between the primary and secondary arcs of a double rainbow?

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Correct answer: Alexander's band

Named after the ancient Greek philosopher Alexander of Aphrodisias who first described it in 200 AD, this band appears darker because light reflected in this region does not reach the observer's eyes, creating a stark contrast in the sky. Photo: Gnangarra, Wikimedia Commons, CC BY 3.0 au.

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Source: Wikipedia (CC BY-SA)

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