Royal Observatory, Greenwich
OBSERVATORY IN GREENWICH, LONDON, UK
RGO; Greenwich Royal Observatory; Royal Observatory Greenwich; Greenwich Observatory; Royal Greenwich Observatory; Greenwich Observatory, England; Greenwich observatory; Annie Maunder Astrographic Telescope; The Royal Observatory Greenwich; The Royal Observatory in Greenwich; The Royal Observatory, Greenwich
The Royal Observatory, Greenwich (ROG; known as the Old Royal Observatory from 1957 to 1998, when the working Royal Greenwich Observatory, RGO, temporarily moved south from Greenwich to Herstmonceux) is an observatory situated on a hill in Greenwich Park in south east London, overlooking the River Thames to the north. It played a major role in the history of astronomy and navigation, and because the Prime Meridian passes through it, it gave its name to Greenwich Mean Time, the precursor to today's Coordinated Universal Time (UTC).