| 单词 | transit circle |
| 释义 | > as lemmastransit circle transit circle n. Astronomy (now historical) a transit telescope equipped with a large graduated circle, by which the right ascension and declination of a star may be determined by observation of it in transit (sense 6b); a meridian circle n. 2. ΘΚΠ the world > the universe > cosmology > science of observation > astronomical instruments > transit instrument > [noun] transit instrument1744 transitory1744 transit circle1793 meridian circle1809 1793 F. Wollaston in Philos. Trans. (Royal Soc.) 83 133 (heading) A Description of a Transit Circle, for determining the Place of celestial Objects as they pass the Meridian. 1897 Edinb. Rev. July 68 In 1851 a new transit circle, of great optical power and enormous mechanical stability, superseded Troughton's masterpiece of 1812. 2015 telegraph.co.uk (Nexis) 13 Aug. The Prime Meridian was set in 1884 using the large Transit Circle telescope built by Sir George Biddell Airy, the 7th Astronomer Royal. < as lemmas |
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