![]() It served as the internationally recognized prime meridian from 1884 to 1984, when it was superseded by the International Reference Meridian (IRM), which differs from it only slightly.Īny imaginary line joining the North and South poles that is used to locate a position on Earth’s surface in an east-west direction is a longitudinal line, or meridian. Because it indicated 0° longitude, it was also known as the prime meridian. It passes through Greenwich, a borough of London, and terminates at the North and South poles. Greenwich meridian, also called prime meridian, an imaginary line, last established in 1851, that was used to indicate 0° longitude. ![]()
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