Bulletin C number 40

[IERS EOP Product Center]

     INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS) 

SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE


SERVICE DE LA ROTATION TERRESTRE
OBSERVATOIRE DE PARIS                                   
61, Av. de l'Observatoire 75014 PARIS (France)
Tel.      : 33 (0) 1 40 51 22 26
FAX       : 33 (0) 1 40 51 22 91
Internet  : services.iers at obspm.fr

                                               Paris, 14 July 2010
                                                           

                                               Bulletin C 40
                                
                                               To authorities responsible                   
                                               for the measurement and 
                                               distribution of time             
                                                                                        


                          INFORMATION ON UTC - TAI
                      

 NO positive leap second will be introduced at the end of December 2010.
 The difference between Coordinated Universal Time UTC and the 
 International Atomic Time TAI is :		
		
     from 2009 January 1, 0h UTC, until further notice : UTC-TAI = -34 s

 Leap seconds can be introduced in UTC at the end of the months of December 
 or June,  depending on the evolution of UT1-TAI. Bulletin C is mailed every  
 six months, either to announce a time step in UTC, or to confirm that there 
 will be no time step at the next possible date.


                                             Daniel GAMBIS
                                             Director			
                                             Earth Orientation Center of IERS
					     Observatoire de Paris, France


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