Atomic Clock

An atomic clock is the most precise timekeeping device, measuring time by the unchanging resonant frequency of atoms. Often using cesium, these clocks define international time scales and are vital for global navigation and satellite systems.

See also

Linked from: Caesium, Cesium, Chronometry, Cold Atom, Coordinated Universal Time, Laser Cooling, Leap Second, Quartz Clock, Rubidium, Time Standard, Ultracold Atoms, Universal Time
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