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Greenwich meridian - [astronomy] The meridian adopted by international agreement in 1884 as the prime meridian, the 0-degree meridian from which all other longitudes are calculated. The Greenwich prime meridian runs through the Royal Observatory in Greenwich, England.
[Category=Geospatial ]
Source: esri, 06 May 2012 09:51:42, http://support.esri.com/en/knowledgebase/GISDictionary/term/abbreviation
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