1# @(#)leapseconds 7.15
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1# @(#)leapseconds 7.16 |
2 3# Allowance for leapseconds added to each timezone file. 4 5# The International Earth Rotation Service periodically uses leap seconds 6# to keep UTC to within 0.9 s of UT1 7# (which measures the true angular orientation of the earth in space); see 8# Terry J Quinn, The BIPM and the accurate measure of time, 9# Proc IEEE 79, 7 (July 1991), 894-905. 10# There were no leap seconds before 1972, because the official mechanism 11# accounting for the discrepancy between atomic time and the earth's rotation 12# did not exist until the early 1970s. 13 14# The correction (+ or -) is made at the given time, so lines 15# will typically look like: 16# Leap YEAR MON DAY 23:59:60 + R/S 17# or 18# Leap YEAR MON DAY 23:59:59 - R/S 19 20# If the leapsecond is Rolling (R) the given time is local time 21# If the leapsecond is Stationary (S) the given time is UTC 22 23# Leap YEAR MONTH DAY HH:MM:SS CORR R/S 24Leap 1972 Jun 30 23:59:60 + S 25Leap 1972 Dec 31 23:59:60 + S 26Leap 1973 Dec 31 23:59:60 + S 27Leap 1974 Dec 31 23:59:60 + S 28Leap 1975 Dec 31 23:59:60 + S 29Leap 1976 Dec 31 23:59:60 + S 30Leap 1977 Dec 31 23:59:60 + S 31Leap 1978 Dec 31 23:59:60 + S 32Leap 1979 Dec 31 23:59:60 + S 33Leap 1981 Jun 30 23:59:60 + S 34Leap 1982 Jun 30 23:59:60 + S 35Leap 1983 Jun 30 23:59:60 + S 36Leap 1985 Jun 30 23:59:60 + S 37Leap 1987 Dec 31 23:59:60 + S 38Leap 1989 Dec 31 23:59:60 + S 39Leap 1990 Dec 31 23:59:60 + S 40Leap 1992 Jun 30 23:59:60 + S 41Leap 1993 Jun 30 23:59:60 + S 42Leap 1994 Jun 30 23:59:60 + S 43Leap 1995 Dec 31 23:59:60 + S 44Leap 1997 Jun 30 23:59:60 + S 45Leap 1998 Dec 31 23:59:60 + S 46
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47# INTERNATIONAL EARTH ROTATION SERVICE (IERS)
48# SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE
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47# INTERNATIONAL EARTH ROTATION SERVICE (IERS) 48# SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE |
49# 50# SERVICE DE LA ROTATION TERRESTRE 51# OBSERVATOIRE DE PARIS 52# 61, Av. de l'Observatoire 75014 PARIS (France) 53# Tel. : 33 (0) 1 40 51 22 26 54# FAX : 33 (0) 1 40 51 22 91 55# Internet : iers@obspm.fr 56#
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57# Paris, 14 January 2002
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57# Paris, 1 July 2003 |
58#
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59# Bulletin C 23
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59# Bulletin C 26 |
60#
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61# To authorities responsible
62# for the measurement and
63# distribution of time
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61# To authorities responsible 62# for the measurement and 63# distribution of time |
64#
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65# INFORMATION ON UTC - TAI
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65# INFORMATION ON UTC - TAI |
66#
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67# NO positive leap second will be introduced at the end of June 2002.
68# The difference between UTC and the International Atomic Time TAI is :
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67# NO positive leap second will be introduced at the end of December 2003. 68# The difference between UTC and the International Atomic Time TAI is: |
69#
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70# from 1999 January 1, 0h UTC, until further notice : UTC-TAI = -32 s
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70# from 1999 January 1, 0h UTC, until further notice: UTC-TAI = -32 s |
71# 72# Leap seconds can be introduced in UTC at the end of the months of December
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73# or June, depending on the evolution of UT1-TAI. Bulletin C is mailed every
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73# or June, depending on the evolution of UT1-TAI. Bulletin C is mailed every |
74# six months, either to announce a time step in UTC, or to confirm that there 75# will be no time step at the next possible date. 76#
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77# Daniel GAMBIS
78# Director
79# Earth Orientation Center of IERS
80# Observatoire de Paris, France
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77# Daniel GAMBIS 78# Director 79# Earth Orientation Center of IERS |
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