The New UTC Time Signals

beginning januaey 1, 1972, the standard time signal broadcasts no longer give directly the rotational position of the Earth to an accuracy of 1/10 of a second of time, as had been done previously. Instead the new UTC Time Signals may depart from the rotational position of the Earth by as much as 9/10 of a second. To retrieve the rotational position of the Earth to an accuracy of 1/10 of a second, it is necessary to apply a supplementary correction DUT1 which is coded into the time signal itself. Methods for using DUT1 in various applications are reviewed.