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单词 tropical line
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tropical line
a. Designating each of the two points on the celestial sphere at which the sun reaches its greatest distance north or south of the celestial equator and begins to move back towards it again ( tropical point: cf. tropic n. 1b), or each of the circles on the celestial sphere parallel to the equator which touch the ecliptic at one of these points ( tropical circle or tropical line: cf. tropic n. 1c); = tropic adj.1 2a. Now rare.In quot. 1778 in figurative context.
ΚΠ
c1400 ( G. Chaucer Treat. Astrolabe (Cambr. Dd.3.53) (1872) i. §17. 9 The plate vnder thi Riet is descriued with 3 tropikal [c1400 Brussels, c1425 Rawl. principal] cerclis, of wiche the leste is cleped the cercle of cancer.
1592 R. Tanner Brief Treat. Ready Use Sphere 8 Next followeth the two tropicall Cyrcles.
1659 J. Moxon Tutor to Astron. & Geogr. 99 When the Sun is neer the Equinoctial points the Daies lengthen or shorten very fast: but when he is neer the Tropical points, very slowly.
1727 G. Ollyffe Disc. Divine Power 26 How great must be the Authority that rules the Sun and Moon..that the Sun should not be permitted to run altogether to or beyond one of the Tropical Lines, either of North or South, without returning to give an equal Visit to the other?
1778 G. L. Way Learning at Loss II. 85 So far it has been in a State of Improvement. It is then at its Point Tropical, its Solstice, its Zenith of Perfection.
1832 E. C. Brown Passion & Reason III. 390 The sun having gained his utmost tropical point, his solstitial fervor had mellowed.
1919 Open Court 33 362 Each of the twelve zodiac houses is subdivided into five sections by the two polar and two tropical circles.
extracted from tropicaladj.n.
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