There's also the time error correction that's done to ensure the accuracy of clocks that get their timing signal from the AC electric supply. https://en.wikipe

There's also the time error correction that's done to ensure the accuracy of clocks that get their timing signal from the AC electric supply. https://en.wikipedia.org/wiki/Utility_frequency#Time_error_correction_(TEC) https://en.wikipedia.org/wiki/Utility_frequency#Time_error_c...