NIST-F1, Atomic clock facility at National Institute of Standards and Technology, Boulder, United States
NIST-F1 measures time by tracking 9,192,631,770 oscillations of cesium atoms within a vacuum chamber maintained at 27 degrees Celsius.
The NIST-F1 atomic clock began operating in December 1999 as the primary time and frequency standard for the United States civilian measurements.
This atomic clock facility represents a cornerstone of modern scientific advancement in precision timekeeping technology for the United States measurement system.
The time measurements from NIST-F1 support numerous technologies including GPS navigation, telecommunications networks, and electrical power grid synchronization.
The clock maintains such precise measurements that it would take 20 million years to gain or lose one second.
GPS coordinates: 39.99400,-105.26400
Latest update: May 27, 2025 11:41
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