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单词 tropic circle
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tropic circle
tropic circle n. (a) Geography = sense A. 2a; (b) Astronomy = sense A. 1c. [Compare post-classical Latin circulus tropicus (13th cent. in a British source), Byzantine Greek τροπικὸς κύκλος, Middle French, French cercle tropique (1550 or earlier).]
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the world > the earth > geodetic references > [noun] > latitude > tropic
tropica1527
tropic circle1556
tropic line1577
trope1735
the world > the universe > celestial sphere > circle of celestial sphere > [noun] > lesser circle > tropic
tropic1503
tropic line1577
tropic line1667
tropic circle1893
1556Tropic circle [see sense B. 1a].
1658 J. Robinson Endoxa x. 56 They that dwell between the Arctick and Tropick Circles, have, on each side, the same temper both of Sun and Soil, yet under divers Constellations.
1780 W. Smellie tr. Comte de Buffon Nat. Hist. Gen. & Particular I. 237 In America, the Cordeliers..lie precisely under the equator, and they extend on both sides a considerable way beyond the Tropic circles.
1893 Philos. Trans. 1892 (Royal Soc.) A. 183 660 The eastward velocity of the Earth at either of the tropic circles is less than that at the Equator by about 87 miles per hour.
2003 A. Jones in B. Inwood Stoics 329 The ecliptic..is another circle, also bisecting the sphere but tilted with respect to the celestial equator, and tangent to the two tropic circles at opposite points.
extracted from tropicn.adj.1
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