Greenwich mean noon

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• Greenwich Mean Time — (GMT) is a term originally referring to mean solar time at the Royal Observatory in Greenwich, London. It is now often used to refer to Coordinated Universal Time (UTC) when this is viewed as a time zone, although strictly UTC is an atomic time… …   Wikipedia

• Greenwich Mean Time — ➡ GMT. * * *       the name for mean solar time of the longitude (0°) of the Royal Greenwich Observatory in England. The meridian at this longitude is called the prime meridian or Greenwich meridian.       Greenwich Mean Time was used for clearly …   Universalium

• Greenwich Mean Time (GMT) — Former name for mean solar time of the longitude (0°) of the former Royal Observatory at Greenwich, England, or Greenwich meridian. GMT was used to avoid potentially confusing references to local time systems (zones). In accord with tradition,… …   Universalium

• Mean time — Time Time, n.; pl. {Times}. [OE. time, AS. t[=i]ma, akin to t[=i]d time, and to Icel. t[=i]mi, Dan. time an hour, Sw. timme. [root]58. See {Tide}, n.] 1. Duration, considered independently of any system of measurement or any employment of terms… …   The Collaborative International Dictionary of English

• Noon Gun — Seen firing on 4th September 2008 The Noon Gun has been an historic time signal in Cape Town, South Africa since 1806. The gun is situated on Signal Hill, close to the centre of the city …   Wikipedia

• greenwich civil time — noun see greenwich time * * * Green|wich Time, Greenwich Civil Time, or Greenwich Mean Time «GREHN ihj, GRIHN ; ihch», the standard time used in Great Britain and formerly the basis for setting standard time elsewhere. It is determined by setting …   Useful english dictionary

• Washington mean time — was the time at the meridian through the center of the old dome atop the main building at the old US Naval Observatory at Washington, D.C. This Washington meridian was defined on 28 September 1850 by the United States Congress (9 Stat. 515). The… …   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

• ΔT — This article is about the time difference. For the temperature difference, see psychrometrics. ΔT vs. time from 1657 to 1984[1] ΔT, Delta T, delta T, deltaT, or DT is the time difference obtained by subtracting Universal Time (UT) from… …   Wikipedia

• The Nautical Almanac — This article is about the British official publications generically known by the name of The Nautical Almanac. For other uses including other nautical almanacs, see Nautical almanac (disambiguation). The Nautical Almanac has been the familiar… …   Wikipedia

• Эфемеридное время — Эфемеридное время, ET  равномерная шкала времени, основанная на определении секунды, введенном в 1952 году на 8 съезде Международного Астрономического Союза, которое не зависит от изменяющейся скорости вращения Земли. В 1956 году Генеральной …   Википедия