OMEGA's London 2012 Countdown Clock on the line where time begins

Half marathon notice

Visitor notice: On Sunday 4 March Cutty Sark and the museum car park will be closed for the Vitality Big Half Marathon. All other museums will be open as normal and DLR and rail links will be running. Find out about road closures

Greenwich-countdown-clock300.jpgThe Royal Observatory, Greenwich is famously the home of the Prime Meridian of the World (0° Longitude) where each day and year officially begins, and of Greenwich Mean Time (GMT), as well as of the celebrated Harrison timekeepers.

Now the Royal Observatory is also home to OMEGA's London 2012 Countdown Clock. Installed on the Prime Meridian Line by OMEGA, the Official Timekeeper of the Games, the clock will tick away the seconds, minutes, hours and days until the start of the London 2012 Olympic Games - some of which will be hosted in Greenwich Park.

The clock was unveiled yesterday (27 July 2011) in time to celebrate 'One Year to Go' to the start of the Games.