NIST-F1 Cesium Fountain Atomic Clock

NIST-F1, the nation's primary time and frequency standard, is a cesium fountain atomic clock developed at the NIST laboratories in Boulder, Colorado. NIST-F1 contributes to the international group of atomic clocks that define Coordinated Universal Time (UTC), the official world time. Because NIST-F1 is among the most accurate clocks in the world, it makes UTC more accurate than ever before.

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• NIST-F1 Cesium Fountain Atomic Clock
• How Accurate is an Atomic Clock?
• How an Atomic Clock Works
• How an Atomic Clock Works Part Two
• Naval Atomic Clock

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