Radio Controlled Atomic Clocks receive their time from an AM radio signal. The AM radio signal is connected to a true atomic clock. A true atomic clock is a highly accurate clock in which time is established by the vibrations of an atom. Physicist Louis Essen is credited with building the first accurate atomic clock.

In today‚Äôs world atomic clocks are used for many different commercial applications, such as telecommunications, science and technology and cost as much as $500,000. The benefit of accurate atomic clocks is realized everyday when we use our GPS navigation devices in our vehicles. … 

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