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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Nist promotes u. s.

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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.

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

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

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The international system of units (si) defines the second as the.

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