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It takes a bit less than a day for the Earth to complete a full rotation. That’s because the Earth is orbiting the Sun, so it has to rotate a bit further for the Sun to be in the same spot every day.

Jean Calment was the oldest human recorded in recent human history, and she lived for 122 years and 164 days!

True! Up until the 19th century, different towns would set their clocks based on the Sun, so they wouldn’t be set to the same time. This was a big problem for creating train timetables – it was like every station was its own time zone!

All the most accurate clocks in the world are atomic. It’s hard to work out exactly which one is the best because they’re found all around the world, and there’s no good way to send clock signals to compare them with.

Chronometry is the science of timekeeping. The name comes from the ancient Greek words chronos (time) and metron (measurement).