Visit the Royal Observatory, the home of Greenwich Mean Time. Stand on the world-famous Prime Meridian Line and discover London's only Planetarium. | Royal Museums Greenwich

The Royal Observatory in Greenwich is the historic home of British astronomy, Greenwich Mean Time and the world-famous Meridian Line. Established in the 17th century, it was from here that the great scientists of the time precisely mapped the stars to help navigate at sea. Today, you can stand aside the Meridian Line with one foot in the eastern hemisphere and one in the west and marvel at the Great Equatorial Telescope, one of the world’s largest historic telescopes before strolling through Gre