COORDINATED UNIVERSAL TIME
\kə͡ʊˈɔːdɪnˌe͡ɪtɪd jˌuːnɪvˈɜːsə͡l tˈa͡ɪm], \kəʊˈɔːdɪnˌeɪtɪd jˌuːnɪvˈɜːsəl tˈaɪm], \k_əʊ_ˈɔː_d_ɪ_n_ˌeɪ_t_ɪ_d j_ˌuː_n_ɪ_v_ˈɜː_s_əl t_ˈaɪ_m]\
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By DataStellar Co., Ltd
(UTC, World Time) The standard time common toevery place in the world. UTC is derived from InternationalAtomic 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 CoordonnÃ©".BIPM(http://www.bipm.org/enus/5_Scientific/c_time/time_1.html).The Royal Observatory Greenwich(http://rog.nmm.ac.uk/leaflets/time/time.html).History of UTC and GMT(http://ecco.bsee.swin.edu.au/chronos/GMT-explained.html).U.S. National Institute of Standards & Technology(http://its.bldrdoc.gov/fs-1037/dir-009/_1277.htm).UK National Physical Laboratory(http://npl.co.uk/npl/ctm/time_scales.html).US Naval Observatory(http://tycho.usno.navy.mil/systime.html).International Telecommunications Union(http://itu.int/radioclub/rr/arts02.htm).Earth's irregular rotation(http://foldoc.org/pub/misc/earth_rotation).
By Denis Howe
Word of the day
- Preparations of pathogenic organisms or their derivatives made nontoxic and intended for active immunologic prophylaxis. They include deactivated toxins.