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单词 autumnal point
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autumnal point
autumnal point n. Astronomy the point on the celestial equator at which it is intersected by the ecliptic and which the sun passes at the autumnal equinox; = first point of Libra n. at point n.1 Phrases 5d. Cf. vernal point n. at vernal adj. Additions.
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1731 N. Bailey Universal Etymol. Eng. Dict. (ed. 2) II Autumnal Equinox, the time when the sun is in the autumnal point.
1763 R. Heath Palladium Extraordinary 73 At the Sign Libra, or autumnal Equinox, he [sc. John Kennedy] objects to the Excess of Minutes and Seconds of Time above whole Days and Hours, as they are observed by the professed Astronomers, in compleating their periodical Revolutions to that autumnal Point.
1854 E. Willard Astronography vii. 81 Spica Virginis is now on the Ecliptic 15° from the Autumnal Point.
1984 D. Hill Hist. Engin. Classical & Medieval Times (1996) x. 193 This inconvenience was remedied by the Spanish Arab al-Zarqāli..who made the vernal or the autumnal point the centre, and the meridian passing through the solstitial the plane of projection.
2012 R. De Laet Casual Sky Observer's Guide xi. 211 The Sun now moves towards the autumnal point in Virgo, which will be reached around September 22 or 23.
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更新时间:2025/1/12 4:23:12