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kemikuk t1_ir8vdde wrote

Let me try They have 2 amazing clocks that tick less than 1 s out of step in 10^19 s. But how do you synchronize them if they are far away from each other. If you send radio waves there will be a delay. That delay can be compensated if it is constant. But the atmospheric fluctuations make the delay change in time. That effectively ruins your super precise clock signal coming from a distance. That is the challenge, as far as I understand.