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Date: Thu, 5 Jan 2012 15:16:36 +0100
From: IERS EOP Product Center <[email protected]>
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Subject: Bulletin C number 43
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     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
e-mail    : [email protected]
http://hpiers.obspm.fr/eop-pc

                                              Paris, 5 January 2012
                                                           =

                                              Bulletin C 43
                                =

                                              To authorities responsible =

                                              for the measurement and =

                                              distribution of time              
                           =



                                   UTC TIME STEP
                            on the 1st of July 2012
                      =


 A positive leap second will be introduced at the end of June 2012.
 The sequence of dates of the UTC second markers will be:               =

                =

                          2012 June 30,     23h 59m 59s
                          2012 June 30,     23h 59m 60s
                          2012 July  1,      0h  0m  0s
              =

 The difference between UTC and the International Atomic Time TAI is:

  from 2009 January 1, 0h UTC, to 2012 July 1  0h UTC  : UTC-TAI =3D - 34s
  from 2012 July 1,    0h UTC, until further notice    : UTC-TAI =3D - 35s =

  =

 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
                                              Head              =

                                              Earth Orientation Center of I=
ERS
                                              Observatoire de Paris, France

__________________________________________


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