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Greenwich Mean Time (GMT) is the local mean time at the Royal Observatory in Greenwich, London, counted from midnight. It is also used as a name for the time zone UTC+00:00 and the basis for civil time in the United Kingdom.
Coordinated Universal Time (UTC) is the primary time standard globally used to regulate clocks and time. It is based on atomic clocks and is not adjusted for daylight saving time. Learn about its history, uses, mechanism, and leap seconds.
A time zone is an area that observes a uniform standard time for legal, commercial and social purposes. Learn how time zones are defined by offsets from Coordinated Universal Time (UTC), and see a table of locations and their UTC offsets with or without daylight saving time.
[2] [3] This was changed later in 1880, when Greenwich Mean Time was legally adopted throughout the island of Great Britain under the Statutes (Definition of Time) Act 1880 (43 & 44 Vict. c. 9). GMT was adopted on the Isle of Man on 30 March 1883, [4] Jersey in 1898, and Guernsey in 1913. Ireland adopted GMT in 1916, supplanting Dublin Mean ...
The Greenwich Time Signal (GTS) is a series of six short tones broadcast by BBC Radio stations to mark the precise start of each hour. Learn about the history, structure, usage and accuracy of the pips, and how they are generated and transmitted.
Learn about the history and significance of the Greenwich meridian, a prime meridian that passes through London, England. Find out how it was established, how it differs from the modern IERS Reference Meridian, and how it is marked by a laser and a brass strip.
Standard time is the synchronization of clocks within a region to a single time standard, usually based on Greenwich Mean Time. Learn how standard time was established in different countries and regions, and how it relates to daylight saving time and time zones.
Greenwich is a historic town with maritime and royal connections, located 5.5 miles east-south-east of Charing Cross. It is the home of the Greenwich Meridian, Greenwich Mean Time, the Royal Naval College and the National Maritime Museum.