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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