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 historic Prime Meridian of the World at the home of Greenwich Mean Time (GMT)
Visit the home of GMT
Prices
Adult: From £16.00
Child: From £8.00
Make the most of your day out
Prices
Adult: £25
Child: £12.50
Unlimited entry all year from £49, including Planetarium shows
Direct Debit
Individual: £50
Family: From £60
One-off
Individual: £60
Family: From £70
Visitor notice: All Royal Museums Greenwich sites are currently closed to visitors, but you can still join us for online events and search our digital collections. Find out more
Stand on the historic Prime Meridian of the World at Royal Observatory Greenwich, the home of Greenwich Mean Time (GMT).
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
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