circumhorizontal arc

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circumhorizontal arc

[¦sər·kəm‚här·ə′zänt·əl ′ärk]
(optics)
A halo phenomenon consisting of a colored arc, red on its upper margin; it extends for about 90° parallel to the horizon and lies about 46° below the sun.
References in periodicals archive ?
Rather, it was a rare phenomenon called a circumhorizon arc.
The rare and beautiful sight is a weather phenomenon called a circumhorizon arc.