Recommendation 1 of the 78th CIPM (1989)

Synchronization of UTC(k) and UTC

The Comité International des Poids et Mesures,


  • that sorne laboratories report values of UTC(k) to the Bureau International des Poids et Mesures (BIPM) that show significant departures from UTC,
  • that the close agreement of timing centres with UTC facilitates the operation of a number of systems in astronomy, geodesy, navigation and telecommunications,


  • that laboratories, in consultation with the BIPM, use appropriate means to reduce existing offsets between UTC(k) and UTC to a few microseconds without making any adjustment in frequency to clocks contributing to TAI.

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

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