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In Europe, many countries have radio signals that many clocks use to sync their time that is based on some atomic clocks. For example, in Germany these are called Funkuhr and the signal comes from an atomic clock in Braunschweig if I'm not mistaken.



We have this in North America as well. The station is called WWVB.

https://www.nist.gov/time-distribution/radio-station-wwvb




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