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coordinated universal time
co·or·di·nat·ed universal time (kō-ôr′dn-ā′tĭd)n. Abbr. UTC An international time standard calculated by atomic clock and incorporating occasional leap seconds to compensate for changes in the rotation of the earth. Coordinated universal time serves as the basis for standard time around the world.coor′dinated univer′sal time`
n. (usu. caps.) standard time equivalent to Greenwich Time but corrected by atomic clocks to match the earth's rotation. Coordinated Universal TimeAn atomic time scale that is the basis for broadcast time signals. Coordinated Universal Time (UTC) differs from International Atomic Time by an integral number of seconds; it is maintained within 0.9 seconds of UT1 (see Universal Time) by introduction of Leap Seconds. The rotational orientation of the Earth, specified by UT1, may be obtained to an accuracy of a tenth of a second by applying the UTC to the increment DUT1 (where DUT1 = UT1 - UTC) that is broadcast in code with the time signals. Also called UTC. See also International Atomic Time; Universal Time; ZULU Time.Thesaurus| Noun | 1. | coordinated universal time - Greenwich Mean Time updated with leap secondsUTCGMT, Greenwich Mean Time, Greenwich Time, universal time, UT, UT1 - the local time at the 0 meridian passing through Greenwich, England; it is the same everywhereEarth-received time, ERT - the coordinated universal time when an event is received on Earthtransmission time, TRM - the coordinated universal time when a transmission is sent from Earth to a spacecraft or other celestial bodySCET, spacecraft event time - the coordinated universal time on board the spacecraft; "SCET = TRM + OWLT" |
TranslationsHora Universal CoordinadaTiempo Universal CoordinadoCoordinated Universal Time
coordinated universal time (UTC) See universal time.Coordinated Universal Time (UTC)A time based on the fundamental properties of an atom, the isotope of cesium 133, and not on the movement of heavenly bodies. Atomic time increases at a constant rate, unlike the GMT (Greenwich mean time). This time is corrected for the seasonal variation in the earth's rotation about the sun to bring it within +/−0.1 s of GMT. When the correction reaches +/−0.7 s, a positive or negative leap second is applied to the UTC.Coordinated Universal Time (time, standard)(UTC, World Time) The standard time common toevery place in the world. UTC is derived from International Atomic Time (TAI) by the addition of a whole number of "leapseconds" to synchronise it with Universal Time 1 (UT1), thusallowing for the eccentricity of the Earth's orbit, therotational axis tilt (23.5 degrees), but still showing theEarth's irregular rotation, on which UT1 is based.
Coordinated Universal Time is expressed using a 24-hour clockand uses the Gregorian calendar. It is used in aeroplaneand ship navigation, where it also sometimes known by themilitary name, "Zulu time". "Zulu" in the phonetic alphabetstands for "Z" which stands for longitude zero.
UTC was defined by the International Radio ConsultativeCommittee (CCIR), a predecessor of the ITU-T. CCIRRecommendation 460-4, or ITU-T Recommendation X.680 (7/94),contains the full definition.
The language-independent international abbreviation, UTC, isneither English nor French. It means both "CoordinatedUniversal Time" and "Temps Universel Coordonn?".
BIPM.
The Royal Observatory Greenwich.
History of UTC and GMT.
U.S. National Institute of Standards & Technology.
UK National Physical Laboratory.
US Naval Observatory.
International Telecommunications Union.
Earth's irregular rotation.See CUT
See CUTcoordinated universal time
Synonyms for coordinated universal timenoun Greenwich Mean Time updated with leap secondsSynonymsRelated Words- GMT
- Greenwich Mean Time
- Greenwich Time
- universal time
- UT
- UT1
- Earth-received time
- ERT
- transmission time
- TRM
- SCET
- spacecraft event time
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