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The time displayed above is synced from the cesium atomic clock at Fort Collins, CO at the NIST.
The National Institute of Standards and Technology develops information technology standards for security of the systems in place for U.S. federal agencies.
A signal is broadcasted from that location on an AM band which reaches across most areas of the United States.
The Atomic clocks you use in your home has a receiver which will receive this AM signal which sets the hands on the clock and will continued making adjustments
as long as the clock received the signal.