How do we find the accuracy of atomic clocks?
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The nearest we have to a standard is International Atomic Time. This is:
TAI as a time scale is a weighted average of the time kept by over 200 atomic clocks in over 50 national laboratories worldwide.
The errors in individual clocks can be assessed by comparing them to the weighted average.
— answered Dec 18, 2014 at 18:06
— John Rennie
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We measure multiple clocks against each other and compare the statistical errors. This assumes that the clocks do not have the same systematic errors, of course. In practice this is controlled by using different technologies with different systematic errors and by having multiple clocks of the same technology built and operated by different groups of people in different locations of the world. In addition we are also comparing against precision clocks provided by nature, like pulsars. While those are not quite as accurate as our atomic clocks, they are guaranteed to be independent of us. – CuriousOne Dec 18, 2014 at 14:31
— Physics StackExchange
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