Recommendation 2 of the 5th CCDS (1970)

Definition of TAI

International Atomic Time (TAI) is the time reference coordinate established by the Bureau International de l'Heure on the basis of the readings of atomic clocks operating in various establishments in accordance with the definition of the second, the unit of time of the International System of Units.

reference The reader should note that the official version of this Resolution is the French text

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