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TAI Quick reference
...a multiplicity of atomic clocks, coordinated through the US Naval Observatory. 1970 CIPM: ‘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.’ 1971 14th CGPM: ‘ considering that the second, unit of time of the International System of Units, has since 1967 been defined in terms of a natural atomic frequency,...