Atomic time

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Temps Atomique International (TAI) or International Atomic Time is a very accurate and stable time scale. It is an average of the time kept by many cesium clocks (atomic clocks) all over the world, and has been available since 1955.

It is maintained by the Bureau International des Poids et Mesures: see http://www.bipm.fr/enus/5_Scientific/c_time/time_1.html .