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	Topics Astronomy Atomic clocks Bridges Calculators Earth's magnetic field Electricity Engineering Engines Fluids Gravity Lightning Measurement and real-life Miscellany Nobel Prize winners Optics Particle physics Physics meets biology Physics meets Earth science Scientist biographies Semiconductors and computers Sound Spacecraft Theme park physics Thermodynamics Tides Units of measurement		Topic: Atomic clocks How an atomic clock works The basic workings of an atomic clock. The official US time Input your time zone and see the official US time accurate to within 0.3 seconds. Based on an atomic clock with accuracy much better than 0.3 seconds!