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  2. Prime meridian (Greenwich) - Wikipedia

    en.wikipedia.org/wiki/Prime_meridian_(Greenwich)

    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.

  3. United Kingdom Ordnance Survey Zero Meridian - Wikipedia

    en.wikipedia.org/wiki/United_Kingdom_Ordnance...

    The United Kingdom Ordnance Survey Zero Meridian is the prime meridian used by the Ordnance Survey (OSGB36 datum). It is about six metres to the west of the Airy meridian marked at Greenwich . When the first Ordnance Survey map was published in 1801, the official Prime Meridian of Great Britain was the one established by the third Astronomer ...

  4. Royal Observatory, Greenwich - Wikipedia

    en.wikipedia.org/wiki/Royal_Observatory,_Greenwich

    The Royal Observatory, Greenwich (ROG; [1] known as the Old Royal Observatory from 1957 to 1998, when the working Royal Greenwich Observatory, RGO, temporarily moved south from Greenwich to Herstmonceux) is an observatory situated on a hill in Greenwich Park in south east London, overlooking the River Thames to the north.

  5. Greenwich - Wikipedia

    en.wikipedia.org/wiki/Greenwich

    Greenwich is notable for its maritime history and for giving its name to the Greenwich Meridian (0° longitude) and Greenwich Mean Time. The town became the site of a royal palace, the Palace of Placentia, from the 15th century and was the birthplace of many Tudors, including Henry VIII and Elizabeth I.

  6. International Meridian Conference - Wikipedia

    en.wikipedia.org/wiki/International_Meridian...

    The French did not adopt the Greenwich meridian as the beginning of the universal day until 1911. Even then it refused to use the name "Greenwich", instead using the term "Paris mean time, retarded by 9 minutes and 21 seconds". France finally replaced this phrase with "Coordinated Universal Time" (UTC) in 1978. [13]

  7. Greenwich Mean Time - Wikipedia

    en.wikipedia.org/wiki/Greenwich_Mean_Time

    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.

  8. Greenwich Meridian Line to Charge Visitors - AOL

    www.aol.com/lifestyle/2011-01-31-greenwich...

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  9. Prime meridian - Wikipedia

    en.wikipedia.org/wiki/Prime_meridian

    The prime meridian of the Moon lies directly in the middle of the face of the Moon visible from Earth and passes near the crater Bruce. The prime meridian of Mars was established in 1971 [35] and passes through the center of the crater Airy-0, although it is fixed by the longitude of the Viking 1 lander, which is defined to be 47.95137°W. [36]