Measuring time

Keeping track of time helps us make sense of our world. Read all about the history of timekeeping, find out who the pioneers of timekeeping were and learn about the instruments they created. Plus, discover what gems are on display at the Time & Longitude gallery of the Royal Observatory Greenwich.

The Royal Observatory Greenwich is famous world-wide as the home of Greenwich Mean Time (GMT). But what is GMT and why is it so important?

Pages