Abstract
Throughout history humans have tried to keep time by tracing the motion of the Sun, Moon and other celestial bodies. That is still true today because absolute time – as measured by atomic clocks – is still tied to astronomical time, which is determined by the Sun's changing position in the sky and hence the rotation of the Earth. But this astronomical time is not constant, since the rotation of the Earth is continuously slowing down. Keeping the two types of time in step with one another has required the introduction of “leap seconds”, which are periodically added to the time recorded by atomic clocks.
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