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Prime Meridian
Encyclopedia Article
Prime Meridian, the meridian, or line of longitude, that is designated 0° longitude and from which the longitude of all points on the surface of the earth are measured. The meridian passing through the original site of the Greenwich Observatory in Greenwich, England, has been recognized by international agreement since 1884 as the prime meridian. It is sometimes called the Greenwich meridian. See Latitude and Longitude.
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