Universal Time 1 - définition. Qu'est-ce que Universal Time 1
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Qu'est-ce (qui) est Universal Time 1 - définition

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
  • An 1853 "Universal Dial Plate" showing the relative times of "all nations" before the adoption of universal time

Universal Time         
¦ noun Greenwich Mean Time, as used internationally.
Universal Time         
<time, standard> (UT) The mean solar time along the prime meridian (0 longitude) that runs through the Greenwich Observatory outside of London, UK, where the current system originated. UT is tied to the rotation of the Earth in respect to the fictitious "mean Sun". Greenwich Mean Time (GMT) was measured from Greenwich mean midday until 1925 when the reference point was changed from noon to midnight and the name changed to "Universal Time". There are three separate definitions, UT0, UT1, and UT2, depending on which corrections have been applied to the Earth's motion. Coordinated Universal Time is kept within 0.9 seconds of UT1, by addition of leap seconds to International Atomic Time. (2001-08-02)
Coordinated Universal Time         
  • 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)

Wikipédia

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).