Radio Controlled
Watches that never need to be adjusted – this is no pipedream, but reality in radio-controlled watches. The transmitter in Mainflingen, Germany, continuously sends time signals generated by the caesium atomic clock in Braunschweig. At a distance of within 1,500 km or just over 930 miles from the transmitter, this guarantees a precision tolerance of one second in a million years in radio-controlled watches.
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