| 单词 | radiant point |
| 释义 | > as lemmasradiant point radiant point n. a central point from which lines or rays diverge; (Astronomy) the radiant (sense B. 3) of a meteor shower. ΘΚΠ the world > matter > physics > electromagnetic radiation > light > emission of light, radiation > [noun] > point from which rays proceed radiant point1665 focus1704 focal point1713 radiant1728 radiator1811 point source1894 the world > the universe > constellation > comet or meteor > meteor > [noun] > shower > focal point of radiant1864 radiant point1864 1665 R. Hooke Micrographia lix. 241 For the discovery of small Stars, the bigger the aperture be, the better adapted is the Glass;..by that means, uniting more Rays very near to one point, it does make many of those radiant points conspicuous. 1737 J. Rowning Nat. Philos. iii. 34 Let the Distance of the radiant Point be 20, and the Radius of Convexity be 5. 1833 N. Arnott Elements Physics (ed. 5) II. 209 If the distance of the radiant point be very great, they [sc. the rays] really are..nearly parallel. 1864 A. S. Herschel in Monthly Notices Royal Astron. Soc. (1865) 33 Two radiant-points of shooting stars..presented themselves in Auriga and in Cetus. 1907 Amer. Math. Monthly 14 64 The resulting four triangles..will be commonly co-polar in the radiant point O. 1991 C. A. Ronan Nat. Hist. Universe 146/1 Thus there are the Perseids with their radiant point in Perseus, the Leonids with a radiant in Leo, and so on. < as lemmas |
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