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The line down the middle of this 1911 map is the prime meridian, shown passing through Greenwich. Saxavord and Balta at the top of the map are in the Shetland Islands, the most northerly parts of Scotland and the United Kingdom. Shetland lies 1° W of the prime meridian.
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.
UTC+00:00 (GMT in winter/BST in summer) – Main territory of the United Kingdom, Saint Helena, Ascension and Tristan da Cunha, Guernsey, Isle of Man, Jersey UTC+01:00 – Gibraltar UTC+02:00 – Akrotiri and Dhekelia UTC+06:00 – British Indian Ocean Territory: Time in the United Kingdom: Canada: 6
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.
The subject to discuss was the choice of "a meridian to be employed as a common zero of longitude and standard of time reckoning throughout the world". [1] It resulted in the recommendation of the Greenwich Meridian as the international standard for zero degrees longitude. [1]
This map was made by combining version 2023d of the List of tz database time zones with OpenStreetMap data, using open source software. [ 1 ] The tz database is a collaborative compilation of information about the world's time zones and rules for observing daylight saving time , primarily intended for use with computer programs and operating ...
The IDL does not extend into Antarctica on the world time zone maps by the United States Central Intelligence Agency (CIA) [10] or the United Kingdom's His Majesty's Nautical Almanac Office (HMNAO). [11] The IDL on modern CIA maps now reflects the most recent shifts in the IDL [10] (see § Historic alterations below).
World map of time zones, with the UTC−12 time zone highlighted. Anywhere on Earth ( AoE ) is a calendar designation that indicates that a period expires when the date passes everywhere on Earth. It is a practice to help specify deadlines such as "March 16, 2004, End of Day, Anywhere on Earth (AoE)" [ 1 ] without requiring timezone ...