| 单词 | zenith distance |
| 释义 | > as lemmaszenith distance zenith distance n. the angular distance of a celestial object from the zenith (the complement of its altitude or angular distance from the horizon). ΘΚΠ the world > the universe > heavenly body > position of heavenly body > [noun] > other declinationc1400 meridian altitudec1400 angle of position?a1560 zenith distance1588 refraction1603 azimuth1626 amplitude1627 horizontal parallax1665 complement1703 aberration1737 hour-angle1837 intercept1901 1588 A. Ashley tr. L. J. Wagenaer Mariners Mirrour sig. B2 For if the declination be Southward, it must be subducted from the Zenithes distance: but if Northward, added. 1658 J. Collins Sector on Quadrant 243 Get the sum and difference of half the Suns Zenith distance at the hour of six. 1704 J. Harris Lexicon Technicum I. Zenith Distance, is the Complement of the Sun, or Stars Meridian Altitude, or what the Meridian Altitude wants of 90 Degrees. 1854 L. Tomlinson tr. D. F. J. Arago Pop. Lect. Astron. 41 Zenith-distances and azimuths form..a system of angles, by means of which it is easy to fix the positions of the stars with extreme precision. 1934 H. S. Jones Gen. Astron. (ed. 2) ii. 26 Corrections for refraction must be applied to all astronomical observations in order to reduce apparent zenith distance to true zenith distance. 2009 H. W. Duerbeck in G. D. Roth Handbk. Pract. Astron. viii. 210 At large zenith distances, each point-like stellar image is widened to a noticeable spectrum. < as lemmas |
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