An atomic clock is a timekeeping device that uses an atomic oscillator to maintain accurate time. It is the most accurate type of clock available, and is used as the international standard for timekeeping. The first atomic clock was built in 1955, and since then they have become increasingly accurate and widely used.
Atomic clocks work by counting the vibrations of atoms. The frequency of these vibrations (the atom’s resonant frequency) is incredibly stable, much more so than any other known measure. This makes them ideal for use as a timekeeping reference. By accurately measuring the resonant frequency of atoms, an atomic clock can keep time with incredible accuracy.
The most common type of atomic clock uses cesium atoms. Cesium has a particularly stable resonance frequency, making it ideal for use in clocks. These clocks are typically accurate to within one second over thousands of years! Atomic clocks are also used in GPS satellites to help ensure precise positioning information.
If you’ve ever wondered how your watch or phone keeps such accurate time, it’s likely thanks to anatomic clock somewhere nearby keeping track of seconds ticked off relentlessly day and night!