Federal Agency
  on Technical Regulating
  and Metrology

  FSUE "VNIIFTRI"



                                 B U L L E T I N E    A - 2607

                                           22 December 2025


            UNIVERSAL TIME AND TERRESTRIAL POLE MOTION


    Data         MJD      UT1(SU)-UTC    X(SU)      Y(SU)
    (0h UT)                   (s)         (")        (")

                       W E E K L Y    V A L U E S
  YEAR  2025
  Dec.   9      61018      +0,077395    +0,12391    +0,31674 
        10      61019      +0,076982    +0,12278    +0,31676 
        11      61020      +0,076482    +0,12168    +0,31671 
        12      61021      +0,075981    +0,12088    +0,31654 
        13      61022      +0,075538    +0,12048    +0,31651 
        14      61023      +0,075169    +0,12035    +0,31672 
        15      61024      +0,074914    +0,12003    +0,31731 

                          P R E D I C T I O N
  YEAR  2025/26
  Dec.  22      61031      +0,07723     +0,1161     +0,3205   
        29      61038      +0,07478     +0,1117     +0,3239   
  Jan.   5      61045      +0,07369     +0,1071     +0,3300   
        12      61052      +0,07032     +0,1006     +0,3370   
        19      61059      +0,07274     +0,0914     +0,3464   
        26      61066      +0,06982     +0,0859     +0,3553   
  Feb.   2      61073      +0,07036     +0,0769     +0,3652   

     NOTATION:
MJD - Modifired Julian Day; MJD=JD-2400000,5;
UT1(SU), X(SU), Y(SU) - Universal Time UT1 and terrestrial pole motion
                        components, evaluated State Service for Time,
                        Frequency and EOP evaluation - SSTF;
UTC -  Universal Time Coordinated;
TA(SU) - Atomic Time scale of Russian Federation;
Difference UTC-TA(SU) = -33,17276 s (from 1 July 2015),
                        -34,17276 s (from 1 January 2017).


                                 Main Metrological Center
                                       of SSTF