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Greenwich Mean Time (GMT) is the local mean time at the Royal Observatory in Greenwich, London, counted from midnight. At different times in the past, it has been calculated in different ways, including being calculated from noon ; [ 1 ] as a consequence, it cannot be used to specify a particular time unless a context is given.
The development of Universal Time began at the International Meridian Conference. At the end of this conference, on 22 October 1884, [b] the recommended base reference for world time, the "universal day", was announced to be the local mean solar time at the Royal Observatory in Greenwich, counted from 0 hours at Greenwich mean midnight. [5]
This time zone is the basis of Coordinated Universal Time (UTC) and all other time zones are based on it. In ISO 8601, an example of the associated time would be written as 2069-01-01T12:12:34+00:00. It is also known by the following geographical or historical names: Greenwich Mean Time [1] Western European Time [1] Azores Summer Time [1]
UTC has been widely embraced by most countries and is the effective successor to Greenwich Mean Time (GMT) in everyday usage and common applications. [a] In specialized domains such as scientific research, navigation, and timekeeping, other standards such as UT1 and International Atomic Time (TAI) are also used alongside UTC.
Time zones of the world. A time zone is an area which observes a uniform standard time for legal, commercial and social purposes. Time zones tend to follow the boundaries between countries and their subdivisions instead of strictly following longitude, because it is convenient for areas in frequent communication to keep the same time.
Pacific Time, Eastern Time, Greenwich Mean Time — and one day, perhaps, Moon Time? ... it may require a universal method for lunar timekeeping. A standard, agreed-upon time zone for the moon ...
For 1916, DST extended from 21 May to 1 October, with transitions at 02:00 standard time. On 1 October 1916, Greenwich Mean Time was introduced to Ireland. [5] At the beginning of the 20th century, Sandringham Time was used by the royal household. This practice was abolished by King Edward VIII in an effort to reduce confusions over time.
UTC: Coordinated Universal Time, equivalent to Greenwich Mean Time, by which all airlines’ operations are calibrated. Times on schedules are shown in local time throughout. VAT: Value Added Tax ...