Royal Observatory
Visit the home of GMT
- Guaranteed entry time
- Stand on the Meridian Line
- Explore the historic buildings
- Planetarium
Prices
Adult: From £16.00
Child: From £8.00
Stand on the Prime Meridian Line
Coronavirus reopening
Visitor notice: All of our sites have reopened and we can't wait to welcome you back. All visitors will need to book a ticket in advance. Find out how we're keeping you safe
Essential information
Opening times:
10.30am – 4pm daily
Admission:
Ticketed
Location:
Royal Observatory, Meridian Line and Historic Royal Observatory, Meridian Courtyard
Stand on the historic Prime Meridian of the World at Royal Observatory Greenwich, the home of Greenwich Mean Time (GMT).
- Grab an iconic selfie on the historic Prime Meridian Line of the world and share using #PrimeMeridian
- Discover the remarkable story behind the reference line for Greenwich Mean Time (GMT).
- Tickets to the Meridian Line and Historic Royal Observatory also includes admission to our Time galleries and Great Equatorial Telescope.
- Look out for the green laser which marks the Meridian Line in the evening sky from the top of the hill in Greenwich Park towards the London Skyline.
Since the late 19th century, the Prime Meridian at Greenwich has divided the eastern and western hemispheres of the earth - just as the equator divides the northern and southern hemispheres.
In 1884 the Prime Meridian was defined by Transit Circle telescope at the Royal Observatory which was built by Sir George Biddell Airy, the 7th Astronomer Royal, in 1850. The cross-hairs in the eyepiece of the telescope precisely defined Longitude 0° for the world.
Find out more about the historic Prime Meridian of the World
#PrimeMeridian
Share your best photos with us via Facebook, Instagram or Twitter. Don't forget to include #PrimeMeridian
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Print
The meridian line in Greenwich represents the Prime Meridian of the world,...
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Available from our Online Shop, our exclusive replica Shepherd Wall Clock.
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