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I saw a bright rainbow right overhead, but there was no rain falling??

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I saw a bright rainbow right overhead, but there was no rain falling??

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What you saw was not the rainbow, but a halo, most likely the circumzenith arc. Halos form in ice crystals, which are equally capable of producing colored arcs like the rainbow. These form in different parts of the sky, however. • I saw a rainbow with several violet and green color bands inside?? These color bands are called the supernumerary bows and are a consequence of the wave-nature of light. The bands are caused by a phenomenon called light interference. Interference happens whenever waves of some sort in a medium interact with eachother. At some places, the waves amplify eachother, and at other places they extinguish eachother. Here, the waves are light waves, and the medium is air. The supernumeraries form when the raindrops are much of the same size. • I saw a rainbow that was straight (not round)?? You probably saw a small section of the rainbow, maybe with the sun low in the sky. If the rain-producing storm was in the distance, you’d have seen a short vertical pillar, which

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