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Your experience Step into the home of Greenwich Mean Time with entry to the historic Royal Observatory in London. Getting started Begin your visit at the main entrance, where your ticket will be validated. Explore at your own pace and download the free audio guide for additional insights as you navigate the site. What to expect Royal Observatory Greenwich Founded in 1675, the Royal Observatory Greenwich is a landmark of scientific discovery and the birthplace of the Prime Meridian. This site has shaped global navigation and timekeeping for centuries. Features Prime Meridian Line: Stand with one foot in each hemisphere on the world-famous line that sets the standard for global time. Historic Time Ball: See the famous time ball descend at 1pm daily, a tradition that once helped ships synchronize their chronometers for navigation at sea. Octagon Room: Explore this original 17th-century space, designed by Sir Christopher Wren, where early astronomers observed the skies. Extras Enhance your visit with a Royal Museums Greenwich Day Pass to explore other sites like the Queen's House and the National Maritime Museum or choose an early access guided tour of the Royal Observatory.