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Time is defined operationally to be that which is measured by clocks. The SI unit of time is the second, which is defined to be "the duration of $9, 192, 631, 770$ periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium $133$ atom."

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Are time and motion the same thing?

If time froze, the common conception would be that everything would stop moving. But let's do it the other way around : if everything stopped moving, would time stop? … If we can make no distinction between "times stops thus nothings moves" or "nothing moves thus time stops", then isn't it some kind of a clue that time and motion and the very same thing? …
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