eli5: What do we use to measure the accuracy of the worlds most accurate clock?

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The Optical Lattice clock will lose one second every 15 billion years.
How do we know?

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You make multiple clocks and regularly compare them with each other at high precision. You need to very carefully compensate for differences caused by relativistic effects. Even small changes in altitude or the local strength of gravity will be noticeable with clocks of this accuracy.

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