1# @(#)leapseconds 7.14
| 1# @(#)leapseconds 7.15
|
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
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#
| 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
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#
|
57# Paris, 25 June 2001
| 57# Paris, 14 January 2002
|
58#
| 58#
|
59# Bulletin C 22
| 59# Bulletin C 23
|
60#
| 60#
|
61# To authorities responsible
62# for the measurement and
63# distribution of time
| 61# To authorities responsible
62# for the measurement and
63# distribution of time
|
64#
| 64#
|
65# INFORMATION ON UTC - TAI
| 65# INFORMATION ON UTC - TAI
|
66#
| 66#
|
67# NO positive leap second will be introduced at the end of December 2001.
68# The difference between UTC and the International Atomic Time TAI is :
| 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 :
69#
70# from 1999 January 1, 0h UTC, until further notice : UTC-TAI = -32 s
|
69#
| 71#
|
70# from 1999 January 1, 0h UTC, until further notice : UTC-TAI = -32 s
| 72# Leap seconds can be introduced in UTC at the end of the months of December
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.
|
71#
| 76#
|
72# Leap seconds can be introduced in UTC at the end of the months of December
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#
77# Daniel GAMBIS
78# Director
79# Earth Orientation Center of IERS
| 77# Daniel GAMBIS
78# Director
79# Earth Orientation Center of IERS
80# Observatoire de Paris, France
|
| |