Royal Observatory Greenwich

The Royal Observatory Greenwich is the centre of Britain's astronomical history. For nearly 400 years, it has been at the forefront of space study, and stands on the Prime Meridian - the centre of the planet.

The London Pass Visit The Royal Observatory Greenwich with The London Pass. Discover the stars, and the origins of Greenwich Mean Time (GMT) Normally £18.00 - Included with London Pass

Discover the past, present and future wonders of astronomy at the Royal Observatory Greenwich - the centre of time. Take a fascinating journey through the historic home of British astronomy, Greenwich Mean Time and the Prime Meridian of the World.

Enjoy access to Royal Greenwich Observatory with The London Pass®

- Pay nothing at the door, simply show your pass.
- Learn about how time was standardised, how the first telescope was made, and how science has changed through the ages.
- The pass grants you a free audio guide and access to any current exhibitions, tours, and lectures included with general admission.

Please note: Customers are advised to arrive early to avoid any disappointment of not being admitted.

Pass Perk

Pass holders can benefit from Priority Lane entry. Save time on entry with a dedicated lane.

Please note: During busy periods, all visitors may still need to queue. 

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- Royal Observatory Greenwich history

- Royal Observatory Greenwich highlights

- Royal Observatory Greenwich facts

- Current exhibitions

- Know before you go

- Getting in

- Make the most of your London Pass

- How to get there

Royal Observatory Greenwich history

As Europeans took to the seas to explore the world and trade with other countries, astronomical information was needed to make journeys safer. That's why, in the 17th Century, King Charles II appointed a Royal Commission to look into investing in astronomy. Among those sitting on the Royal Commission was Sir Christopher Wren, a former professor of astronomy at Oxford, now best-known for his architectural work. In 1675, the Commission reported back to Charles II, recommending the foundation of an observatory, Britain’s first state-funded scientific institution. That very day, plans were set in motion. John Flamsteed was named ‘astronomical observator’, and a new era for astronomy, time and navigation had begun.

Wren suggested using the ruined Greenwich Castle as the site for the new observatory and designed the building. The site had the advantage of being on higher ground, and already had solid foundations. The first building, Flamsteed House, was built in less than a year, and cost just over £500. Flamsteed spent 40 years there, making over 50,000 observations of the moon and stars. Flamsteed and Edmond Halley, the first two astronomical observators, plotted every star visible in the north and southern hemispheres. Their work was key in helping to develop the first accurate clocks.

Up until the late 1800s, there were no measurements of time that were consistent both nationally and internationally. And in a world becoming more globalised every day from the construction of railways and international shipping lanes, an international time standard was vital.
That's why, in 1884, the International Meridian Conference was called, and Greenwich successfully became the Prime Meridian of the World.

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Royal Observatory Greenwich highlights

  • Stand astride the world-famous Meridian Line, with one foot in the east and the other in the west.

  • Learn about how great scientists first mapped the seas and the stars and stand astride two hemispheres on the Prime Meridian Line.

  • See pioneering inventions and the UK’s largest refracting telescope. Touch a 4.5 billion-year-old asteroid.

  • Enjoy breath-taking views across the whole of London.

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Royal Observatory Greenwich 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.

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Current Exhibitions

Follow this link to see the current exhibitions at the Royal Observatory Greenwich.

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Know before you go

- Some exhibits/shows require the purchase of tickets. Please check the Royal Observatory Greenwich website for pricing and bookings.

- A gift shop is on-site.

- Cloakrooms are available. Visitors can leave coats and bags while they peruse the exhibits.

- Toilets and baby-changing facilities are on site.

- The Royal Observatory Greenwich is fully accessible, including toilets and the cafe. Guide dogs, hearing dogs, and assistance dogs are welcome too.

- Language guides are available in the following languages:
English, Simplified English (Great for kids and those learning English), French, German, Spanish, Italian, Brazilian Portuguese, Russian, Chinese, Japanese and Korean.

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Getting in

Use the designated Priority Lane and present your Pass at the entrance.

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Make the most of your London Pass

While you're there, why not check out the Cutty Sark and the National Maritime Museum? Both are included with The London Pass®.

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How to get there

- Cutty Sark - DLR
- Greenwich rail station and Maze Hill rail station
- Greenwich Pier

- 129, 177, 180, 188, 199 and 386

Visit the Royal Observatory Greenwich website for more travel information.


For more things to do in London, check out The London Pass® blog.

- Opening times: 10 am - 5 pm.

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Visiting Royal Observatory Greenwich

Visiting Royal Observatory Greenwich

  • Royal Observatory Greenwich Blackheath Ave, London SE10 8XJ
  • Closest Underground Station Cutty Sark DLR
  • Closest Bus Stop Stop S: Route 53

Opening Times

Monday 10.30 - 16.00
Tuesday 10.30 - 16.00
Wednesday 10.30 - 16.00
Thursday 10.30 - 16.00
Friday 10.30 - 16.00
Saturday 10.30 - 16.00
Sunday 10.30 - 16.00
Last Admission: 15.30

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