| 单词 | astronomical horizon |
| 释义 | > as lemmasastronomical horizon astronomical horizon n. the horizon that would be seen if the earth's surface were perfectly smooth; the intersection of a horizontal plane through an observer with the celestial sphere; cf. horizon n. 3a. ΚΠ 1765 T. H. Croker et al. Compl. Dict. Arts & Sci. II. at Horizon Rational, True, or Astronomical Horizon, called generally the horizon, is a great circle. 1860 Jrnl. Royal Asiatic Soc. 17 325 The Ufk is the true or astronomical horizon, which separates the upper from the lower hemisphere. 1896 H. A. Howe Study of Sky xii. 218 The air..bends rays of light which pass through it. On this account we see the sun after it is really below the astronomical horizon. 2007 M. G. Firneis in D. R. Evans tr. G. Vörös Egyptian Temple Archit. 167 It is this glare along with atmospheric extinction which, depending on the star's magnitude, prohibits its visibility down to the astronomical horizon. < as lemmas |
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