| 单词 | coordinated universal time |
| 释义 | > as lemmasCoordinated Universal Time An internationally accepted standard time corresponding to mean solar time at the Greenwich meridian, calculated from midnight as zero; spec. (more fully Coordinated Universal Time; also Universal Time Coordinated, Universal Coordinated Time) an international timekeeping standard calculated using International Atomic Time and adjusted to accommodate the difference between atomic time and solar time by the periodic addition of a leap second to account for irregularities in the Earth's rotation. Abbreviated UT, UTC.Although Universal Time has officially superseded the use of Greenwich Mean Time, the latter term is still used informally to refer to Universal Time. UT has generally been equivalent to GMT, except that, prior to the year 1925, GMT was reckoned from noon for astronomical purposes. The addition of leap seconds began on 1st January 1972. Times in astronomy are usually expressed in UT. ΘΚΠ the world > time > reckoning of time > [noun] > systems of reckoning time of day time1646 apparent time1694 local timea1703 Greenwich Mean Time1782 sun time1837 GMT1840 railway time1847 railroad time1849 Greenwich time1861 Eastern time1878 Pacific time1880 Universal Time1882 Eastern Standard Time1883 Mountain time1883 British Standard Time1908 daylight saving1908 zone time1908 LMT1909 British Summer Time1916 summertime1916 U.T.1929 B.S.T.1930 EST1935 British Double Summer Time1941 war time1942 B.D.S.T.1943 ephemeris time1950 1848 Blackwood's Mag. Mar. 357/2 Perhaps our excellent councillors are not aware that there is no such thing as a universal time. There is no peculiar virtue in the Greenwich time.] 1882 Monthly Notices Royal Astron. Soc. 42 205 The American Meteorological Society further considered it desirable that in the future a universal time reckoned from the meridian 180° from that of Greenwich should be generally introduced. 1929 Trans. Internat. Astron. Union 3 224 The terms Greenwich Civil Time (G.C.T.), Weltzeit (W.Z.) and Universal Time (U.T.) denote time measured from Greenwich Mean Midnight, and are not ambiguous. 1960 Federal Reg. 31 Dec. 14052/1 On January 1, 1961, the National Bureau of Standards will commence a regular broadcast..of a timing code which gives the day, hour, minute and second (Universal Time) and which is locked in phase to the frequency and time signals. 1970 Science 16 Jan. 278/3 To obtain the mass of Mars, we fitted Doppler data from 26 July, 5 days before encounter, to 31 July, 04:39:57 (Universal Time Coordinated). 1981 Science 30 Jan. 441/1 At approximately 3 a.m. (7:59:04.3 coordinated universal time) on 12 December 1979, Colombia and Ecuador were shaken by a major earthquake. 1999 Sky & Telescope Oct. 116/3 Universal Time (UT or UTC) is used worldwide by astronomers and others to avoid confusion between time zones. 2008 Times (Nexis) 20 June 37 Today 11.59pm Universal Co-ordinated Time (UTC) is the summer solstice. < as lemmas |
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