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U.S. NAVAL OBSERVATORY WASHINGTON, D.C. 20392-5420 July 23, 1998 No. 64 TIME SERVICE ANNOUNCEMENT SERIES 14 UTC TIME STEP 1. The International Earth Rotation Service (IERS) has announced the introduction of a time step to occur at the end of December, 1998. 2. Coordinated Universal Time (UTC) will be retarded by 1.0s so that the sequence of dates of the UTC markers will be: 1998 December 31 23h 59m 59s 1998 December 31 23h 59m 60s 1999 January 01 0h 0m 0s 3. The difference between UTC and International Atomic Time (TAI) is: from 1997 01 Jul, UTC to 1999 01 January, UTC: TAI-UTC= +31s from 1999 01 Jan, UTC until further notice: TAI-UTC= +32s 4. The insertion of one leap second will be evident by the change of sign of the DUT1 correction which will become positive. Extrapolated values of DUT1 are distributed weekly in the IERS Bulletin A. 5. All coordinated time scales will be affected by this adjustment. However, Loran-C and GPS will not be adjusted physically. Times of Coincidence for LORAN-C are available on the Time Service Web Page (http://tycho.usno.navy.mil/loran.html). For GPS, the leap second correction contained within the UTC data of subframe 4, page 18 of the navigation message transmitted by satellites will change. Before the leap second GPS-UTC = +12 (i.e., GPS is ahead of UTC by twelve seconds) After the leap second GPS-UTC = +13s (i.e., GPS will be ahead by thirteen seconds) DENNIS D. McCARTHY Director Directorate of Time
Time Service Dept., U.S. Naval Observatory, Washington, DC