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.
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:
Your response is appreciated before 30 August 2011
More information about the tz