a borough of Greater London on the Thames; zero degrees of longitude runs through Greenwich; time is measured relative to Greenwich Mean Time
Greenwich England is where East meets West at the Greenwich Meridian (0¡ Longitude); World Time is set to Greenwich Mean Time.
a borough in SE London, England, located on the prime meridian from which geographic longitude is measured. Also used as a standard for time. See GMT.
Greenwich was a parliamentary constituency in South-East London, which returned Members of Parliament to the British House of Commons from 1832 to 1997.