From: iers@hpopa.obspm.fr Date: Thu, 13 Jan 2000 13:55:27 +0100 (MET) Subject: Bulletin C number 19

INTERNATIONAL EARTH ROTATION SERVICE (IERS) SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE

BUREAU CENTRAL DE L'IERS 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 : iers@obspm.fr

Paris, 13 January 2000

Bulletin C 19

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 June 2000. The difference between UTC and the International Atomic Time TAI is :

from 1999 January 1, 0h UTC, until further notice : UTC-TAI = - 32 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 Central Bureau of IERS