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单词 Hevelian halo
释义 Hevelian halo
[he`vāl·yǝn `hā·lō]
OPTICS
A faint, white halo with an angular radius of 90°, centered on the sun or moon, and only occasionally seen; it is a member of the class of halos reported but not yet fully explained. Also known as halo of Hevelius; halo of 90°.
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