Greenwich Mean Time
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The meridian line at Greenwich in London, England. A meridian line is an imaginary line that runs from the North Pole to the South Pole. By international convention, the meridian line at Greenwich, which runs through the Royal Observatory telescope, marks 0° longitude and is the point from which all other lines of longitude are measured.
Local time on the zero line of longitude (the Greenwich meridian), which passes through the Old Royal Observatory at Greenwich, London. It was replaced in 1986 by coordinated universal time (UTC), but continued to be used to measure longitudes and the world's standard time zones.
See also time.
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