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单词 circumzenithal arc
释义 circumzenithal arc
[¦sǝr·kǝm¦zē·nǝ·thǝl `ärk]
OPTICS
A brilliant rainbow-colored arc of about a quarter of a circle with its center at the zenith and about 46° above the sun, produced by refraction and dispersion of the sun's light striking the top of prismatic ice crystals in the atmosphere, and usually lasting only a few minutes.
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