The Royal Observatory in Greenwich.Licensed from iStockPhoto
- borough of Greater London, England, located on the prime meridian: pop. 208,000: formerly the site of an astronomical observatory
- suburb of Stamford, in SW Conn.: pop. 61,000
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- A borough of Greater London in southeast England on the Thames River. It is the site of the original Royal Observatory, through which passes the prime meridian, or longitude 0°. Population: 228,000.
- A town of southwest Connecticut on Long Island Sound near the New York border. Settled in 1640, it is mainly residential. Population: 62,100.