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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. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Rather, it was a rare phenomenon called a circumhorizon arc. |
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