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The Royal Observatory
The Royal Observatory Greenwich is the home of Greenwich Mean Time and the Prime Meridian of the World. It is also home to London's only planetarium, the Harrison timekeepers and the UK's largest refracting telescope.
Entrance to the Astronomy Centre is FREE. Entrance charges apply to Flamsteed House and the Meridian Courtyard. You can save with a Big Ticket, allowing single entry to each of the Royal Observatory, Cutty Sark and Turner and the Sea (valid for 30 days). Please visit our Turner and the Sea page to buy a Big Ticket.