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atomic clock
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How do atomic clocks work?
cesium atomic clock Atomic time
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Videos

How do atomic clocks work?
Overview of clocks, with a focus on atomic clocks.
Video: Contunico © ZDF Studios GmbH, Mainz
Know how GPS satellites guide airplanes, cars, and even cell phones
Learn how GPS satellites are affected by relativity.
Video: © MinutePhysics (A Britannica Publishing Partner)

Images

cesium atomic clock
Cesium atomic clock.
Encyclopædia Britannica, Inc.
Atomic time
NIST-F1 cesium fountain atomic clock, the primary time and frequency standard for...
National Institute of Standards and Technology (NIST)
VIEW MORE in these related Britannica articles: