Circumhorizontal arc over Ohio, May 2009.
For a circumhorizontal arc to be visible, the Sun must be at least 58 degrees high in a sky where cirrus clouds are present. Furthermore, the numerous, flat, hexagonal ice-crystals that compose the cirrus cloud must be aligned horizontally to properly refract sunlight in a collectively similar manner.
Credit & Copyright: Todd Sladoje
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starredskies33:

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