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Webcurrent and coming generations of atomic clocks, such as the hydrogen maser (a frequency oscillator), the cesium fountain and, in particular, the optical clock.

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Utc(usno) and utc(nist) are kept in very close.

Webatomic clocks are designed to measure the precise length of a second, the base unit of modern timekeeping.

Webthe clocks in the ensemble contribute to international atomic time (tai) and coordinated universal time (utc).

Webthe nature of time/what is time?/date, time interval, and synchronization/ ancient clock watchers/ clocks in nature/keeping track of the sun.

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