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I cannot comprehend. Napkin math says if you move like 50 nanometers within one second this is enough acceleration over time to make these clocks out of sync because relativity. I mean, do points on earth do not move that much by themselves if they are far enough?

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It turns out that cheap chip-scale optical atomic clocks would be a sensor revolution. They are sensitive enough to tell the difference between the first and second floor of a building by gravitational effects alone.

This would require a device to compare the on-board time with an external reference clock of some sort, right?

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