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atomic clock. an extremely accurate electronic clock regulated by the resonance frequency of atoms or molecules of certain substances, as cesium.
All that you have to do is set the time zone, and the clock can display a very accurate time. The only thing more accurate that you can carry around easily is a GPS receiver, which derives atomic clock accuracy in real time from the atomic clocks in orbiting GPS satellites. See How GPS Receivers Work for details. Here are several interesting links: 1  How Atomic Clocks Work. 2  How Radio Works.