MODIFY TIME

        CLIC\MODIFY TIME dut1

    Modify  the time constant DUT1 (in seconds) and recompute the phases ac-
    cordingly. For very high accuracy astrometry, DUT1 may need  to  be  ad-
    justed  afterwards to correct for irregularities for the earth rotation.
    The "a priori" estimates may be wrong.  Another case is  the  leap  sec-
    onds, if they are introduced asynchronously with the DUT1 constant...