circumhorizontal arc

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English[edit]

English Wikipedia has an article on:
Wikipedia

Noun[edit]

circumhorizontal arc (plural circumhorizontal arcs)

  1. An optical phenomenon, a large, brightly spectrum-coloured band running parallel to the horizon, formed by the refraction of sunlight or moonlight in plate-shaped ice crystals suspended in the atmosphere, typically in cirrus or cirrostratus clouds.

Synonyms[edit]

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