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Что (кто) такое Universal Time Coordinated - определение
TIME STANDARD BASED ON THE SLOWING ROTATION OF THE EARTH
Universal Standard Time; UT0; UT2; Ut1; UT1; UT1R; UT2R; UTC-SLS; Universal Time (UT); Universal time
Coordinated Universal Time
![Graph showing the difference [[DUT1]] between UT1 and UTC (in seconds). Vertical segments correspond to leap seconds.](https://commons.wikimedia.org/wiki/Special:FilePath/Leapsecond.ut1-utc.svg?width=200 "Graph showing the difference [[DUT1]] between UT1 and UTC (in seconds). Vertical segments correspond to leap seconds.")
PRIMARY TIME STANDARD
Universal Time Coordinated; Universal Coordinated Time; UTC(Internet); UTC Internet; UTC (Internet); Zulu time; Universal Time Coordinate; Coordinated universal time; Co-ordinated Universal Time; Co-ordinated universal time; Universal co-ordinated time; Utc; U.T.C; U.T.C.; ITU-R TF.460-4; Zulu Time; UTC time; Universal Time Coordination; UTC; Temps Universel Coordonné; Universal Time, Coordinated; History of UTC; Time in Space; Universal time coordinated; Universal Time Co-ordinated; Coordinated Universal Time (UTC)
<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 Earth's orbit, the
rotational axis tilt (23.5 degrees), but still showing the
Earth's 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 Coordonné".
{BIPM
(http://bipm.fr/enus/5_Scientific/c_time/time_1.html) }.
{time/time.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) }.
(2001-08-30)
Universal Time Coordinated
PRIMARY TIME STANDARD
Universal Time Coordinated; Universal Coordinated Time; UTC(Internet); UTC Internet; UTC (Internet); Zulu time; Universal Time Coordinate; Coordinated universal time; Co-ordinated Universal Time; Co-ordinated universal time; Universal co-ordinated time; Utc; U.T.C; U.T.C.; ITU-R TF.460-4; Zulu Time; UTC time; Universal Time Coordination; UTC; Temps Universel Coordonné; Universal Time, Coordinated; History of UTC; Time in Space; Universal time coordinated; Universal Time Co-ordinated; Coordinated Universal Time (UTC)
<time, standard> An incorrect term for {Coordinated Universal
Time}.
(2001-08-01)
Coordinated Universal Time
PRIMARY TIME STANDARD
Universal Time Coordinated; Universal Coordinated Time; UTC(Internet); UTC Internet; UTC (Internet); Zulu time; Universal Time Coordinate; Coordinated universal time; Co-ordinated Universal Time; Co-ordinated universal time; Universal co-ordinated time; Utc; U.T.C; U.T.C.; ITU-R TF.460-4; Zulu Time; UTC time; Universal Time Coordination; UTC; Temps Universel Coordonné; Universal Time, Coordinated; History of UTC; Time in Space; Universal time coordinated; Universal Time Co-ordinated; Coordinated Universal Time (UTC)
Coordinated Universal Time or UTC is the primary time standard by which the world regulates clocks and time. It is within about 1 second of mean solar time (such as UT1) at 0° longitude (at the IERS Reference Meridian as the currently used prime meridian) and is not adjusted for daylight saving time.
Википедия
Universal Time
Universal Time (UT or UT1) is a time standard based on Earth's rotation. While originally it was mean solar time at 0° longitude, precise measurements of the Sun are difficult. Therefore, UT1 is computed from a measure of the Earth's angle with respect to the International Celestial Reference Frame (ICRF), called the Earth Rotation Angle (ERA, which serves as a modern replacement for Greenwich Mean Sidereal Time). UT1 is the same everywhere on Earth. UT1 is required to follow the relationship
- ERA = 2π(0.7790572732640 + 1.00273781191135448 · Tu) radians
where Tu = (Julian UT1 date - 2451545.0).
