meaning of universal time

1. Coordinated Universal Time standard> UTC, World Time The standard time common to every place in the world. UTC is derived from International Atomic Time TAI by the addition of a whole number of "leap seconds" to synchronise it with Universal Time 1 UT1, thus allowing for the eccentricity of the Earths orbit, the rotational axis tilt 23. 5 degrees, but still showing the Earths irregular rotation, on which UT1 is based. Coordinated Universal Time is expressed using a 24-hour clock and uses the Gregorian calendar. It is used in aeroplane and ship navigation, where it also sometimes known by the military name, "Zulu time". "Zulu" in the phonetic alphabet stands for "Z" which stands for longitude zero. UTC was defined by the International Radio Consultative Committee CCIR, a predecessor of the ITU-T. CCIR Recommendation 460-4, or ITU-T Recommendation X. 680 7/94, contains the full definition. The language-independent international abbreviation, UTC, is neither English nor French. It means both "Coordinated Universal Time" and "Temps Universel CoordonnÚ". BIPM http://www. bipm. fr/enus/5_Scientific/c_time/time_1. html. The Royal Observatory Greenwich http://www. 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://www. its. bldrdoc. gov/fs-1037/dir-009/_1277. htm. UK National Physical Laboratory http://www. npl. co. uk/npl/ctm/time_scales. html. US Naval Observatory http://tycho. usno. navy. mil/systime. html. International Telecommunications Union http://www. itu. int/radioclub/rr/arts02. htm. Earths irregular rotation http://www. foldoc. org/pub/earth_rotation.
2. Greenwich Mean Time updated with leap seconds

Related Words

coordinated universal time | universal time | universal time coordinated |

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