| 单词 | prime vertical circle |
| 释义 | > as lemmasprime vertical circle prime vertical n. Astronomy (a) (in full prime vertical circle) a great circle of the celestial sphere which passes through the east and west points of the horizon and through the zenith (where it cuts the meridian at right angles) (now rare); †(b) (in full prime vertical dial) a dial whose plane lies in that of the prime vertical circle (obsolete). ΘΚΠ the world > the universe > celestial sphere > circle of celestial sphere > [noun] > great circle > azimuth circle > prime vertical prime vertical1669 1669 S. Sturmy Mariners Mag. vii. xiv. 21 If a Plane shall decline from the Prime Vertical, and incline to the Horizon. 1704 J. Harris Lexicon Technicum I Prime Verticals, or Direct Erect North or South Dyals, are those whose Planes lie parallel to the Prime Vertical Circle. 1762 Philos. Trans. 1761 (Royal Soc.) 52 185 In taking altitudes, I always observe, when the sun, or other celestial body, is as near the prime vertical, or east and west azimuth, as possible. 1865 J. H. C. Coffin Navigation & Nautical Astron. (ed. 2) ix. 224 The nearer the body is to the prime vertical, the more nearly the line of position coincides with a meridian. 1991 C. Mansall Discover Astrol. iv. 43/1 The Prime Vertical which passes through the east and west points of the horizon, zenith and nadir of the observer's points is applicable only to the earthly references of the horizon and the celestial sphere. < as lemmas |
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