Royal Observatory Greenwich is home to the Prime Meridian of the World and Greenwich Mean Time. Shop or range of books, clocks and exclusive watches and clothing.
Discover more about the origins of the Royal Observatory, the famous Prime Meridian line, why it is in Greenwich, and its history with our informative publications and books. You can also learn about the vital contribution of John Harrison’s advances in timekeeping to the solution to longitude problem.
The line in Greenwich represents the historic Prime Meridian of the World - Longitude 0º. Shop our range of clothing and exclusive watches, or 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.