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

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

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.

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

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