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 .
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