Most of us take for granted that we have the power to monitor the passage of time, to know at any moment how many minutes remain until our next appointment, or to be able to agree on the time with someone on the other side of the world. This was, of course, not always the case.
How do we measure time? How accurate are today’s clocks relative to the first clocks of ancient times? And what is the definition of a second? Let's take a walk through the evolution of time measurement.
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