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Up to an hour
Royal Observatory Greenwich & Prime Meridian
Up to an hour
Visit the Royal Observatory Greenwich & Prime Meridian and experience incredible history and science with a scenic backdrop.
What visitors are saying
4.5Historical place, beautiful area and park around.
Sep 8, 2025Go City's London pass is an authentic, excellent and organized app for your visit to London.
Aug 11, 2025We were very fortunate to arrive as a very knowledgeable guide was starting a talk about the four Harrison Clocks on display.
Aug 27, 2025What made the visit even better was the staff; everyone from the ticket scanners to the gallery assistants was incredibly friendly and eager to share historical tidbits.
Jan 17, 2026Interesting and reminds us of how important accurate time was once upon a time, and astronomy was a practical science.
Aug 30, 2025- Explore London with The London Pass®Your London pass includes dozens of other top attractions, all for one money-saving price
What you'll do
Step into the world of astronomy and navigation at the Royal Observatory Greenwich, one of the most important scientific sites in history.
Explore the home of the first Astronomer Royal, learn how the stars and seas were mapped, and discover how time was standardized across the globe. See iconic instruments like the UK’s largest refracting telescope, get hands-on with a 4.5-billion-year-old asteroid, and journey through centuries of scientific innovation in a fun, interactive way.
While you’re there, don’t forget to enjoy one of the best views in London from the Observatory grounds.
Royal Observatory Greenwich & Prime Meridian highlights
Prime Meridian
Stand with one foot in the Eastern Hemisphere and the other in the Western at Longitude 0°, the line that divides the world.
Time and Longitude Gallery
Discover the timekeeping breakthroughs that solved the centuries-old challenge of finding longitude at sea, including John Harrison’s famous sea watch.
Flamsteed House
Designed by Sir Christopher Wren, this striking red-brick building was built as the official residence of the Astronomer Royal and remains a central part of the Observatory experience.
Facts
A bright red Time Ball sits on top of Flamsteed House. The ball rises to the top of its mast each day, beginning its ascent at 12.55pm, before dropping at exactly 1pm. Considered one of the earliest public time signaling devices in the world, it first dropped in 1833.
The Royal Observatory Greenwich has a large collection of interesting clocks. Particular highlights include the Russian F.M. Fedchenko pendulum clock, which is said to be one of the most accurate timepieces on the planet. And the Shepherd Gate Clock mounted on the outer wall of the Observatory, which has an unusual 24-hour display
The Prime Meridian goes right down the centre of the planet, at least as far as time is concerned. That means you can literally stand in the middle of the Earth.
What's included
Entry to the Royal Observatory Greenwich and the Prime Meridian
Stand astride the world-famous meridian line at Longitude Zero with one foot in each hemisphere
Access to Flamsteed House and all permanent exhibitions – including the Harrison timekeepers, the Great Equatorial Telescope, the Greenwich Time Ball and the Shepherd Gate clock
Enjoy incredible views of London from the top of Greenwich Park
Free audio tour available in multiple languages, including British Sign Language (BSL)
Planetarium show and tour guide not included
Where you'll be
Blackheath Ave, Greenwich, GBHow to get there
London Underground: take the DLR to Cutty Sark train station.
Standard opening hours
Closings & holidays
24, 25 & 26 December annually
Find out more
For more information, please visit the Royal Observatory Greenwich website.
020 8312 6608
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