| 单词 | prime meridian |
| 释义 | > as lemmasprime meridian prime meridian n. the meridian from which longitude on the earth's surface (and hence time zones) is reckoned. Originally variable (being a meridian on which magnetic variation of the compass was zero in a certain latitude), the meridian passing through the Royal Observatory at Greenwich, England, was adopted internationally as the zero of longitude in 1884. ΘΚΠ the world > the earth > geodetic references > [noun] > longitude > prime meridian prime meridiana1703 Greenwich meridian1715 a1703 R. Hooke Lect. Navigation & Astron. in Posthumous Wks. (1705) 518 Finding the Angle that the Meridian of that place maketh with any other determinate Meridian, whether it be the prime Meridian generally agreed upon, or any other particular Meridian of some notable place from which the Ship departs. 1797 J. Russell Descr. Selenographia 8 The bar which communicates motion to this globe from the other parts of the machine, enters it opposite to that point where the equator and prime meridian intersect each other. 1841 Jrnl. Royal Geogr. Soc. 11 p. x The chronometric differences of longitude hitherto referred exclusively to the prime meridian of Greenwich. 1884 Times 3 Nov. 5/3 The Washington Prime Meridian Conference closed yesterday. Protocols were approved.., fixing Greenwich as the prime meridian. 1991 C. Mansall Discover Astrol. iv. 53/2 Commencing at the Prime Meridian at Greenwich, the globe of the Earth is marked off into twenty-four zones 15° apart. < as lemmas |
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