universal time

universal time
A measure of time that conforms, within a close approximation, to the mean diurnal rotation of the earth and serves as the basis of civil timekeeping. Universal Time is based on mean sidereal time as measured in Greenwich. It is approximately equal to the mean solar time from Greenwich. Like most astronomical calculations, eclipse predictions are usually presented in terms of Universal Time. To convert UT into local time, one has to know what zone he or she is in and apply a zonal correction to the UT. The UTC, or Coordinated Universal Time, is synchronized and adjusted to stay within 0.9 s of UT.
Local times = Zulu time +/− time zone +/− UTI correction

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  • Universal Time — (UT) is a timescale based on the rotation of the Earth. It is a modern continuation of Greenwich Mean Time (GMT), i.e., the mean solar time on the meridian of Greenwich, and GMT is sometimes used loosely as a synonym for UTC. In fact the… …   Wikipedia

  • Universal Time — A measure of time that conforms, within a close approximation, to the mean diurnal rotation of the Earth and serves as the basis of civil timekeeping. Universal Time (UT1) is determined from observations of the stars, radio sources, and also from …   Military dictionary

  • Universal time — noun Date: 1882 Greenwich mean time …   New Collegiate Dictionary

  • Coordinated Universal Time — UTC redirects here. For other uses, see UTC (disambiguation). Coordinated Universal Time (abbreviated UTC) is the primary time standard by which the world regulates clocks and time. It is one of several closely related successors to Greenwich… …   Wikipedia

  • Coordinated Universal Time — An 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… …   Military dictionary

  • Coordinated Universal Time — noun Date: 1969 the international standard of time that is kept by atomic clocks around the world abbreviation UTC; compare Greenwich mean time, Universal time …   New Collegiate Dictionary

  • Time from NPL — Map showing the location of the Anthorn VLF transmitter within Cumbria …   Wikipedia

  • Time in Australia —   UTC+08:00 …   Wikipedia

  • Time zone — Timezone and TimeZone redirect here. For other uses, see Time zone (disambiguation). Local time redirects here. For the mathematical concept, see Local time (mathematics). This article is about time zones in general. For a list of time zones by… …   Wikipedia

  • Time standard — A time standard is any officially recognized specification for measuring time: either the rate at which time passes; or points in time; or both. For example, the standard for civil time specifies both time intervals and time of day. A time scale… …   Wikipedia

  • Time — This article is about the measurement. For the magazine, see Time (magazine). For other uses, see Time (disambiguation). The flow of sand in an hourglass can be used to keep track of elapsed time. It also concretely represents the present as… …   Wikipedia

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