| 单词 | rational horizon |
| 释义 | > as lemmasrational horizon rational horizon n. [compare post-classical Latin horizon rationalis (a1658)] Astronomy (now rare) a great circle of the celestial sphere that is parallel to the horizon and whose centre is the centre of the earth; = horizon n. 3a. ΘΚΠ the world > the universe > celestial sphere > circle of celestial sphere > [noun] > great circle > horizon horizonc1400 finitor1594 rational horizon1599 1599 T. Hill Schoole of Skil ii. 212 The Pole of the rational horizon, is the verticall point. for it is distant by a quarter of the greatest cyrcle, that is, 90. degrees, from the compasse round about of the horizon. 1642 J. Milton Apol. Smectymnuus 46 The rationall horizon in heav'n is but one, and the sensible horizons in earth are innumerable. 1704 J. Harris Lexicon Technicum I. (at cited word) The Rational, Real or True Horizon, is a Circle which encompasses the Earth exactly in the Middle, and whose Poles are the Zenith and Nadir. 1833 J. F. W. Herschel Astronomy i. 52 If we suppose a spectator..to have his view bounded by the rational horizon. 1873 J. N. Lockyer Elem. Lessons Astron. iv. 146 The rational, or true horizon, is a great circle of the heavens, the plane of which..passes through the centre of the Earth. 1974 D. N. Lapedes McGraw-Hill Dict. Sci. & Techn. Terms 238/2 Celestial horizon... Also known as rational horizon. < as lemmas |
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