Comment Accuracy vs Precision (Score 0) 7
Ultimately how do we determine that a clock is 'accurate'?
It is no longer related to the earth's rotation, which is several fractions of a second different.
OK it it's something like 1/9,192,631,770 of a vibration of a cesium atom, but that begs the question of who decided that a second was 9,192,631,770 cesium vibrations long.
In the end, something must be arbitrary.