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单词 meridian passage
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meridian passage
meridian passage n. Astronomy (a) the passage of a celestial object across an observer's meridian; (b) (in full central meridian passage) the transit of a celestial object (esp. a satellite) or a surface feature across the central meridian of one of the superior planets or the sun.
ΚΠ
1776 Philos. Trans. (Royal Soc.) 66 95 (heading) Eastern altitudes. Western altitudes. Meridian passages.
1833 J. F. W. Herschel Astronomy ii. §153. 101 If we note, at the moments of the two observations, the time,..the instant halfway between them will be the moment of the star's meridian passage.
1884 Science 27 June 801/1 Mr. W. F. Denning of Bristol has computed..a new value of the rotation-period of the planet Mars. He observed the central meridian passages of the ‘hour-glass’, or ‘Kaiser Sea’.
1926 Amer. Jrnl. Internat. Law 20 503 He goes a step further,..and determines the mean solar meridian passage at Greenwich on January 1 as January 1 throughout the world.
1947 Monthly Notices Royal Astron. Soc. 107 391 All solar noise storms..in Figs. 2 and 3 coincide with near meridian passage of spots.
1954 Proc. National Acad. Sci. U.S.A. 40 976 Kp is high two days after the central meridian passage of a zone of low coronal excitation.
1999 Cruising World (Nexis) 1 Mar. 96 The Nautical Almanac contains the local mean time of meridian passage (MERPASS) of the sun at any standard meridian.
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