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# @(#)leapseconds       8.7 
 
# 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 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 
# accounting for the discrepancy between atomic time and the earth's rotation 
# did not exist until the early 1970s. 
 
# The correction (+ or -) is made at the given time, so lines 
# will typically look like: 
#       Leap    YEAR    MON     DAY     23:59:60        +       R/S 
# or 
#       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 UTC 
 
# Leap  YEAR    MONTH   DAY     HH:MM:SS        CORR    R/S 
Leap    1972    Jun     30      23:59:60        +       S 
Leap    1972    Dec     31      23:59:60        +       S 
Leap    1973    Dec     31      23:59:60        +       S 
Leap    1974    Dec     31      23:59:60        +       S 
Leap    1975    Dec     31      23:59:60        +       S 
Leap    1976    Dec     31      23:59:60        +       S 
Leap    1977    Dec     31      23:59:60        +       S 
Leap    1978    Dec     31      23:59:60        +       S 
Leap    1979    Dec     31      23:59:60        +       S 
Leap    1981    Jun     30      23:59:60        +       S 
Leap    1982    Jun     30      23:59:60        +       S 
Leap    1983    Jun     30      23:59:60        +       S 
Leap    1985    Jun     30      23:59:60        +       S 
Leap    1987    Dec     31      23:59:60        +       S 
Leap    1989    Dec     31      23:59:60        +       S 
Leap    1990    Dec     31      23:59:60        +       S 
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 
Leap    2008    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 29 
# FAX       : 33 (0) 1 40 51 22 91 
# Internet  : services.iers@obspm.fr 
# 
# Paris, 15 January 2009 
# 
# Bulletin C 37 
# 
# 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 2009. 
# 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. 
# 
# Daniel GAMBIS 
# Head                   
# Earth Orientation Center of the IERS 
# Observatoire de Paris, France