***************************************************************************= *** dorismail 11-Jul-2016 16:37:31 Message No 1031 ***************************************************************************= *** Author: "Lemoine, Frank G. (GSFC-6980)" Subject: Leap second Announcement by the IERS effective Dec 31, 2016-Jan. INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS) =20 SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE =20 SERVICE DE LA ROTATION TERRESTRE DE L'IERS OBSERVATOIRE DE PARIS=20 61, Av. de l'Observatoire 75014 PARIS (France) Tel. : +33 1 40 51 23 35 e-mail : services.iers@obspm.fr http://hpiers.obspm.fr/eop-pc =20 =20 Paris, 6 July 2016 =20 Bulletin C 52 =20 To authorities responsible for the measurement and distribution of time =20 UTC TIME STEP on the 1st of January 2017 =20 =20 A positive leap second will be introduced at the end of December 2016. The sequence of dates of the UTC second markers will be: =20 2016 December 31, 23h 59m 59s 2016 December 31, 23h 59m 60s 2017 January 1, 0h 0m 0s =20 The difference between UTC and the International Atomic Time TAI is: =20 from 2015 July 1, 0h UTC, to 2017 January 1 0h UTC : UTC-TAI =3D - 36s from 2017 January 1, 0h UTC, until further notice : UTC-TAI =3D - 37s =20 =20 =20 Leap seconds can be introduced in UTC at the end of the months of December = or June,=20 depending on the evolution of UT1-TAI. Bulletin C is mailed every six mont= hs,=20 either to announce a time step in UTC,=20 or to confirm that there will be no time step at the next possible date. =20 =20 Christian Bizouard Head Earth Orientation Center of IERS Observatoire de Paris, France Cliquez sur l'url suivante=20 https://www.mailcontrol.com/sr/c93Bb8KXW1zGX2PQPOmvUq10po4Wab0lra+OXQ6Y8IoR= 7DpkH0S1bPaizMzWClhV+vbddXqufp2ZtQUzGWYsdQ=3D=3D=20=20 si ce message est ind=E9sirable (pourriel). Please do not reply directly to this message, but send comments and suggestions to IDS.central.bureau@cls.fr