Universal Time

Universal Time
(UT or Z)
   the correct name for the time system previously called Greenwich Mean Time (GMT): the standard time at longitude 0°. Universal Time is five hours later than Eastern Standard Time in the U.S. It is always stated on the 24-hour clock; thus an event occurring at 1:26:15 pm Eastern Standard Time occurs at 18:26:15 UT (five hours after 13:26:15). Technically, the time shown on clocks is figured from Coordinated Universal Time (UTC), an international system of time measurement regulated by very precise atomic clocks. From time to time (either on June 30 or December 31), UTC is adjusted by the addition of a "leap second". This event, widely reported in the press but poorly understood by the public, keeps UTC within 0.9 seconds of mean solar time at longitude 0° as measured by the Earth's slightly uneven rotation. See day2 for additional information.

Dictionary of units of measurement. 2015.

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  • Universal Time — (UT) is a timescale based on the rotation of the Earth. It is a modern continuation of Greenwich Mean Time (GMT), i.e., the mean solar time on the meridian of Greenwich, and GMT is sometimes used loosely as a synonym for UTC. In fact the… …   Wikipedia

  • Universal Time — n. Greenwich mean time used as a basis for standard time: cf. COORDINATED UNIVERSAL TIME: abbrev. UT …   English World dictionary

  • universal time — (often caps.) See Greenwich Time. Abbr.: UT. [1885 90] * * * Mean (solar) time of the Greenwich meridian (0° longitude). Universal Time replaced the designation Greenwich Mean Time in 1928; since 1972 it has been based on international atomic… …   Universalium

  • Universal Time — Die Universal Time (UT) ist die durch astronomische Beobachtung gewonnene mittlere Ortszeit des durch die Sternwarte von Greenwich führenden Nullmeridians. Sie ist eine universelle Zeitskala, welche die wahre Erdrotation widerspiegelt. In den… …   Deutsch Wikipedia

  • Universal Time — A measure of time that conforms, within a close approximation, to the mean diurnal rotation of the Earth and serves as the basis of civil timekeeping. Universal Time (UT1) is determined from observations of the stars, radio sources, and also from …   Military dictionary

  • Universal Time — noun A measure of time that conforms, within a close approximation, to the mean diurnal rotation of the Earth and serves as the basis of civil timekeeping. Universal Time (UT1) is determined from observations of the stars, radio sources, and also …   Wiktionary

  • universal time — A measure of time that conforms, within a close approximation, to the mean diurnal rotation of the earth and serves as the basis of civil timekeeping. Universal Time is based on mean sidereal time as measured in Greenwich. It is approximately… …   Aviation dictionary

  • universal time — noun the local time at the 0 meridian passing through Greenwich, England; it is the same everywhere • Syn: ↑Greenwich Mean Time, ↑Greenwich Time, ↑GMT, ↑UT, ↑UT1 • Hypernyms: ↑time • Hyponym …   Useful english dictionary

  • Universal Time — /junəvɜsəl ˈtaɪm/ (say yoohnuhversuhl tuym) noun 1. a system of time measurement based on Greenwich Mean Time, but counted from 0 h, which is equivalent to midnight Greenwich Mean Time, introduced in 1928 and used internationally until the… …  

  • universal time — pasaulinis laikas statusas T sritis automatika atitikmenys: angl. universal time vok. Weltzeit, f rus. всемирное время, n; мировое время, n pranc. temps universel, m …   Automatikos terminų žodynas

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