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Up to an hour
Royal Observatory Greenwich & Prime Meridian
Up to an hour
Astronomy and science come to life as you discover the past, present and future at the Royal Observatory Greenwich.
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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 Go City®Your pass includes dozens of other top attractions, all for one money-saving price
What you'll do
Explore everything astronomy at the Royal Observatory Greenwich. You’ll see where east meets west, discover how the seas and the stars were first mapped out by scientific pioneers, and explore the historic home of the first Astronomer Royal.
One of the most important historical scientific sites in the world, the Royal Observatory Greenwich, offers an educational and entertaining visit back in time. There’s a host of things to see in this fascinating museum, learn how time was standardized, how the first telescope was made, and how science and astronomy have changed through the ages. You’ll also get to explore legendary inventions such as the UK’s largest refracting telescope and get hands-on with a 4.5 billion-year-old asteroid.
And while you’re there, don’t forget to take in one of the best views in the city outside of the Observatory.
Royal Observatory Greenwich & Prime Meridian Highlights
Prime Meridian
Straddle the line between the East and West hemispheres of Earth at Longitude 0°.
Time and Longitude Gallery
Learn about the iconic timekeepers that pioneered solving the problem of finding longitude at sea. Explore exhibits such as John Harrison's sea watch.
Flamsteed House
Designed by Sir Christopher Wren, this striking red-brick building was designed as a home for the Astronomer Royal.
Facts
The Royal Observatory was founded in the 1670s by King Charles II to further develop better naval navigation systems.
Greenwich has been marked at 0° Longitude since 1884.
The Greenwich time ball, located on top of Flamsteed House was first used in 1833 for ships' captains to set their chronometers accurately before setting sail. The ball continues to drop at 1PM every day.
What's included
Entry to the permanent exhibitions
Audio guide available in English, simplified English (great for kids or those learning the language), French, German, Spanish, Italian, Brazilian Portuguese, Russian, Chinese, Japanese and Korean.
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View all attractionsWhere 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
Follow this link to see the current exhibitions at the Royal Observatory Greenwich.
020 8312 6608
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