| 单词 | secondary circle |
| 释义 | > as lemmassecondary circle e. secondary circle: Geometry and Astronomy, a great circle passing through the poles of another great circle perpendicular to its plane; see also B. 3. secondary caustic Mathematics (see quot. 1857). ΘΚΠ the world > the universe > celestial sphere > circle of celestial sphere > [noun] > great circle > secondary circle secondary circle1704 secondary1715 the world > relative properties > number > geometry > shape or figure > [noun] > two-dimensional > closed curve > circle > on a sphere great circle?1530 great circle1594 secondary circle1704 secondary1715 orthodrome1855 separator1869 the world > relative properties > number > geometry > curve > [noun] > caustic catacaustic (curve)1708 caustic1738 secondary caustic1857 1704 J. Harris Lexicon Technicum I Secondary Circles. 1857 A. Cayley Coll. Math. Papers (1889) II. 339 The secondary caustic or orthogonal trajectory of the refracted rays, i.e. a curve having the caustic for its evolute. < as lemmas |
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