Awe-inspiring science, historic locations and stunning views combine at the Royal Observatory Greenwich, making it an unmissable day out in London. Find out more about what to expect at the Home of Greenwich Mean Time. Image Stand on the historic Prime Meridian Line Place one foot in the west and one in the east at the Prime Meridian of the world. Learn all about Greenwich Mean Time (GMT) and how Greenwich came to be the home of time. Find out more Why is the Prime Meridian in Greenwich? Marvel at one of the UK's largest telescopes The Great Equatorial Telescope is the largest of its kind in the UK. Anyone visiting Greenwich can see the telescope's distinctive 'onion dome' roof when they look up the hill towards the Royal Observatory. But to truly appreciate the scale of the Great Equatorial Telescope, you have to step inside... Find out more Image Get to know the stars in the Peter Harrison Planetarium Get up close and personal with the stars in one of our planetarium shows led by one of our expert astronomers. Amazing visualisations and real-life space photography combine to provide a truly unique view of our night sky, while live commentary from Observatory astronomers help to make sense of the universe. Please note that shows are not included with entry to the historic Observatory; find times, tickets and prices for all our shows here. See what's on Image Enjoy live science and astronomy demonstrations Get hands-on with a telescope and discover fascinating facts about the Universe this summer! Every weekend a space-tastic team of Observatory Explainers will be around the site, delivering live science demonstrations and astronomy sessions for all ages. Find out more Image Download the free audio guide Follow the tour on your phone! We're partnering with Smartify, the world's most downloaded museum app, to bring you this brand new way to explore the Royal Observatory. Simply download the app to begin. Find out more Image Make time for the Octagon Room The Octagon Room is the oldest part of the Royal Observatory Greenwich. It was commissioned by King Charles II, designed by famed architect Sir Christopher Wren and completed in 1676. Astronomical instruments and clock line the walls and windows, just as they would have been in the Observatory's early years. Find out more Enjoy the best view in London A Unesco World Heritage site in front, the towers of Canary Wharf behind and the snaking River Thames beyond – surely this view is worth the trip alone? Look to the left towards central London and see if you can spy the London Eye, St Paul's Cathedral and more. Find out more Image Tell the time using the Shepherd clock Accurately tell the time with this Shepherd Gate Clock, the first to ever show Greenwich Mean Time (GMT) to the public. Find out more See the world famous Harrison clocks Learn about John Harrison’s epic race to solve the problem of Longitude and admire the craftsmanship of the world famous Harrison timekeepers, including H1, H2, H3 and H4. Find out more Image Wonder at Airy’s Transit Circle Visit the telescope that determined the exact location of the Prime Meridian. Find out more Visit Flamsteed House The gracious apartments of Flamsteed House are where the Astronomers Royal lived and worked. Careful observation combined with intimate family life for these astronomers – proof that working from home is nothing new. Find out more Plan your visit Plan your visit to the Royal Observatory Tickets and prices Book tickets for the National Maritime Museum, Cutty Sark, Royal Observatory and Queen's House What's on at the Peter Harrison Planetarium Out of this world stargazing and astronomy shows for the whole family Shop Royal Observatory Greenwich John Harrison's H4-Inspired Chrome Pocket Watch £175.00 A stunningly crafted, chrome-plated half double hunter pocket watch inspired by John Harrison’s world-changing chronometer... Buy Now Shop Greenwich Shepherd Gate 45cm Wall Clock, 24-Hour Analogue Dial £150.00 Own a Shepherd Gate 45cm clock, exclusively available from the home of Greenwich Mean Time. A stylish 24-hour analogue clock that will make a statement on any wall, with its bold monochrome face, and matte black metal casing... Buy Now Shop On the Line: The Story of the Greenwich Meridian £8.99 The Royal Observatory at Greenwich is the home of time and space, the Prime Meridian and Greenwich Mean Time (GMT). But have you ever stopped to ask what is the Prime Meridian and why it is at Greenwich? Why are all time zones across the world based on GMT? What is longitude and why is the meridian moving? Written by Dr Louise Devoy, Senior Curator of the Royal Observatory at Royal Museums Greenwich... Buy Now Royal Museums Greenwich Close Choose your tickets Royal Observatory Walk the Prime Meridian line See the best view in London Guaranteed entry time Audio guide included Planetarium shows not included Adult £18 Child £9 BOOK NOW Royal Museums Greenwich Day Pass Save 25% with combo ticket Cutty Sark Royal Observatory Guaranteed entry time Planetarium shows not included Adult £27 Child £13.50 BOOK NOW Member tickets Free and fast-track Museums entry Priority booking Access using your membership card Membership card number required BOOK NOW Become a Member Unlimited entry all year Royal Observatory Cutty Sark Planetarium Shows Special exhibitions Direct Debit One-off Individual: £50 Individual: £60 Family: from £60 Family: from £70 JOIN TODAY