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For light to enter the cirrus cloud crystals at just the right angle to make a circumhorizon arc, the sun must be at an angle of at least 58 degrees above the horizon.
A circumhorizon arc only forms when the clouds contain a specific, hexagonally shaped ice crystal.
Several very specific conditions must exist in tandem for a circumhorizon arc to occur.
vanishedone commented on the word circumhorizon
The Cloud Appreciation Society: 'The summertime halo, the fire rainbow, the circumhorizon or the circumhorizontal arc… Whichever of its names you decide call it, this enormous, rare, pastel-coloured optical effect will only appear up in the sky when several different factors happen to occur at the same moment.'
July 2, 2008