Bulletin C number 42

IERS EOP Product Center services.iers at obspm.fr
Fri Jul 8 13:04:45 UTC 2011




     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, 8 July 2011
                                                           

                                             Bulletin C 42
                                
                                             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 2011.
 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


IMPORTANT: After years of discussions, a proposal to fundamentally redefine 
UTC will come to a conclusive vote in January 2012 at the ITU-R in Geneva. 

This proposal would halt the intercalary adjustments known as leap seconds 
that maintain UTC as a form of Universal Time.

The Earth Orientation Center of the IERS organizes a survey online with the 
objective to find out the strength of opinion for maintaining or changing 
the present system.

Link to the questionnaire:

http://hpiers.obspm.fr/eop-pc/index.php?index=questionnaire

Your response is appreciated before 30 August 2011 
__________________________________________




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