circumhorizontal arc

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0.03 sec.

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.

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circumhorizontal arc
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