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  1. A ‘circumhorizon arc,’ sometimes inaccurately called a ‘fire rainbow.’  When the sun shines through cirrus clouds at the right angle, the ice crystals in the clouds cause the light to refract (split) into its component colors. ~World Picture Network, 2006: 

Real
    A ‘circumhorizon arc,’ sometimes inaccurately called a ‘fire rainbow.’ When the sun shines through cirrus clouds at the right angle, the ice crystals in the clouds cause the light to refract (split) into its component colors. ~World Picture Network, 2006:

    Real

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