jessicacti:Circumhorizontal arc over Ohio, May 2009.For a circumhorizontal arc to be visible, the Su
jessicacti: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 -- source link
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