| 单词 | astronomical triangle |
| 释义 | > as lemmasastronomical triangle astronomical triangle n. now historical (on the celestial sphere) a spherical triangle whose corners are respectively a celestial pole, the local zenith, and the object under observation, used in converting between different coordinate systems; also called celestial triangle. ΘΚΠ the world > the universe > celestial sphere > circle of celestial sphere > [noun] > astronomical triangle astronomical triangle1840 celestial triangle1956 1840 E. C. Frome Outl. Method Trigonometr. Surv. x. 136 In the triangle PZS, named from its universal application the astronomical triangle—P is the elevated pole, Z the zenith, and S the star or object observed. 1917 A. H. Holt Man. Field Astron. ii. 11 Each part of the astronomical triangle, with the exception of the angle of the star, may be expressed in terms of the observer's position on the earth's surface (latitude) or the co-ordinates of the star. 1995 L. Motz & J. A. Weaver Story of Astron. ix. 131 The final use of the observatory data and the navigator's data to determine the position of the ship requires the solution of what is known as the ‘navigational’ or ‘astronomical triangle’, the three vertices of which represent, respectively, the position of the ship, the geographical position of the stars (or sun) and the earth's north or south pole. < as lemmas |
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