[amsat-bb] Leap second on June 30, 2012

-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of IERS EOP Product Center Sent: Thursday, January 05, 2012 6:17 AM To: [email protected] Subject: Bulletin C number 43

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 = - 34s from 2012 July 1, 0h UTC, until further notice : UTC-TAI = - 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

IERS Observatoire de Paris, France

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