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.

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How do you know that your watch, clock or phone is telling exactly the right time? At one time, the only way was to look to the roof of the Observatory.

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