What is the true geometric shape of a complete rainbow when viewed without the ground blocking the horizon?
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Rainbows are actually full circles centered on the point directly opposite the Sun from your eyes. We usually only see an arc because the horizon blocks the lower half, but pilots and skydivers occasionally see the full circle. Photo: Eric Rolph at English Wikipedia, Wikimedia Commons, CC BY-SA 2.5.
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Source: Wikipedia (CC BY-SA)
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