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The circumhorizon arc or 'rainbow clouds. This amazingly beautiful natural phenomenon can be observed when the sun rises high in the sky. The rays of the sun when it passes through high-altitude clouds composed of ice crystals in the form of hexagons. The sunlight is refracted in these crystals in bizarre way, and as a result, we see “fire rainbow”. This phenomenon is not local, it can extend over several hundred square miles

Kangaroos & Rainbow in Yarra Valley, Australia

Flint Hills near Alma, Kansas - by Orville Courtney