👑 350 years ago today on 22 June 1675, a royal warrant from Charles II ordered the building of the Royal Observatory in Greenwich. 👑 He had been persuaded by leading scientists that building an observatory would bring Britain closer to working out how to determine longitude at sea - a breakthrough that would boost the country's trade prospects by making global navigation easier, safer and more efficient. 👑 Over the next three and a half centuries, numerous scientific discoveries and advanceme

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

🕰️ British Science Week kicked off yesterday, and with this year’s theme being ‘Time’, where better to get involved than the home of Greenwich Mean Time - the Royal Observatory? We’ve got an exciting array of events happening themed around time from now until 17 March including workshops, talks, tours, craft sessions and more. 🔴 To celebrate this exciting week in STEM, we’re taking a closer look at the striking red time ball on top of the Royal Observatory’s Flamsteed House. Our Curator of Tim

🏅2025 marks the 350th anniversary of the Royal Observatory, Greenwich. 🏅Historic home to Greenwich Mean Time and the Prime Meridian of the World, the Royal Observatory is one of the most important scientific sites in the world. 🏅We're proud to share that @royalmintuk are marking this historic anniversary with a beautiful new UK £2 coin! 🏅The coin pays tribute to the Royal Observatory with a reverse design that features the Shepherd Gate Clock, the constellation Ursa Minor, the star Polaris a

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