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prime meridian - [coordinate systems] In a coordinate system, any line of longitude designated as 0 degrees east and west, to which all other meridians are referenced. The Greenwich meridian is internationally recognized as the prime meridian for most official purposes, such as civil timekeeping.
[Category=Geospatial ]
Source: esri, 17 July 2012 08:07:12, http://support.esri.com/en/knowledgebase/GISDictionary/term/abbreviation
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