Seconds does not measure time, it compares two lengths of different scales. The motion of an oscillator and a unit length. What is measured is length. Nothing else can be measured.
Are you certain? A second is a measure of duration of time, which is standardized via the oscillations of a caeseium atom. There's no reference to length involved as far as I know.
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[ 3.5 ms ] story [ 16.6 ms ] threadSource: https://en.wikipedia.org/wiki/Unit_of_time#:~:text=A%20unit%....