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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 Royal Observatory, Greenwich, founded in 1675, established Greenwich Mean Time (GMT), the mean solar time at that location, as an aid to mariners to determine longitude at sea, providing a standard reference time while each location in England kept a different time.
The Greenwich meridian is a prime meridian, a geographical reference line that passes through the Royal Observatory, Greenwich, in London, England. [ 1] From 1884 to 1974, the Greenwich meridian was the international standard prime meridian, used worldwide for timekeeping and navigation. The modern standard, the IERS Reference Meridian, is ...
Coordinated Universal Time ( UTC) is the primary time standard globally used to regulate clocks and time. It establishes a reference for the current time, forming the basis for civil time and time zones. UTC facilitates international communication, navigation, scientific research, and commerce. UTC has been widely embraced by most countries and ...
Armenia Time / Azerbaijan Time / Georgia Time / Samara Time ( UTC+4) Pale colours: Standard time observed all year. Dark colours: Summer time observed. The United Kingdom uses Greenwich Mean Time (also known as Western European Time or UTC) and British Summer Time ( UTC+01:00) (also known as Western European Summer Time ).
This clock shows Greenwich Mean Time all year round, ie. it is not set to British Summer Time in the summer. A key instrument for determining time was the Airy Transit Circle (ATC), which was used primarily from 1851 to 1938. [ 21 ]
Western European Time ( WET, UTC±00:00) is a time zone covering parts of western Europe and consists of countries using UTC±00:00 (also known as Greenwich Mean Time, abbreviated GMT). [ 1][ 2] It is one of the three standard time zones in the European Union along with Central European Time and Eastern European Time. [ 3][ 2] The following ...
It shows Greenwich Mean Time all year round. The Shepherd Gate Clock ( 51°28′41″N 0°00′05″W) is mounted on the wall outside the gate of the Royal Observatory, Greenwich building in Greenwich, Greater London. The clock, an early example of an electrically connected clock system, was a sympathetic clock mechanism controlled by electric ...