system_cmds-336.10.tar.gz

[apple/system_cmds.git] / zic.tproj / datfiles / leapseconds

diff --git a/zic.tproj/datfiles/leapseconds b/zic.tproj/datfiles/leapseconds
index 279d6bb81a0bd41c08f4d500141739cc59ad6759..a1078837d7f859fe5ce3e4394a4394052bc0d8b7 100644 (file)
--- a/zic.tproj/datfiles/leapseconds
+++ b/zic.tproj/datfiles/leapseconds
@@ -1,10 +1,10 @@
-#      $OpenBSD: leapseconds,v 1.2 1997/01/14 04:36:54 millert Exp $
-# @(#)leapseconds      7.8
+# @(#)leapseconds      7.20
 
 # Allowance for leapseconds added to each timezone file.
 
 # The International Earth Rotation Service periodically uses leap seconds
-# to keep UTC to within 0.9 s of TAI (atomic time); see
+# to keep UTC to within 0.9 s of UT1
+# (which measures the true angular orientation of the earth in space); see
 # Terry J Quinn, The BIPM and the accurate measure of time,
 # Proc IEEE 79, 7 (July 1991), 894-905.
 # There were no leap seconds before 1972, because the official mechanism
@@ -18,7 +18,7 @@
 #      Leap    YEAR    MON     DAY     23:59:59        -       R/S
 
 # If the leapsecond is Rolling (R) the given time is local time
-# If the leapsecond is Stationary (S) the given time is GMT
+# If the leapsecond is Stationary (S) the given time is UTC
 
 # Leap YEAR    MONTH   DAY     HH:MM:SS        CORR    R/S
 Leap   1972    Jun     30      23:59:60        +       S
@@ -41,3 +41,52 @@ Leap 1992    Jun     30      23:59:60        +       S
 Leap   1993    Jun     30      23:59:60        +       S
 Leap   1994    Jun     30      23:59:60        +       S
 Leap   1995    Dec     31      23:59:60        +       S
+Leap   1997    Jun     30      23:59:60        +       S
+Leap   1998    Dec     31      23:59:60        +       S
+Leap   2005    Dec     31      23:59:60        +       S
+
+#      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
+# ...
+# http://hpiers.obspm.fr/eop-pc
+#
+#                                              Paris, 4 July 2005
+#                                                      
+#                                              Bulletin C 30
+#
+#                                              To authorities responsible
+#                                              for the measurement and
+#                                              distribution of time
+#
+#
+#                                    UTC TIME STEP
+#                             on the 1st of January 2006
+#
+# A positive leap second will be introduced at the end of December 2005.
+# The sequence of dates of the UTC second markers will be:
+#
+#                      2005 December 31,     23h 59m 59s
+#                      2005 December 31,     23h 59m 60s
+#                      2006 January   1,      0h  0m  0s
+#
+# The difference between UTC and the International Atomic Time TAI is:
+#
+# from 1999 January 1, 0h UTC, to 2006 January 1  0h UTC  : UTC-TAI = - 32s
+# from 2006 January 1, 0h UTC, until further notice       : UTC-TAI = - 33s
+#
+# 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