1# @(#)leapseconds 8.3
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| 1# @(#)leapseconds 8.4 |
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
46Leap 2005 Dec 31 23:59:60 + S
47
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48# ...
49# Date: Thu, 28 Jun 2007 14:36:55 +0200
50# Message-Id: <200706281236.l5SCatpA020400@callisto.obspm.fr>
51# ...
52# Subject: Bulletin C number 34
53# ...
54# INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS)
55#
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| 48# INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS) |
49# SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE
50#
51# SERVICE DE LA ROTATION TERRESTRE
52# OBSERVATOIRE DE PARIS
53# 61, Av. de l'Observatoire 75014 PARIS (France)
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61# ...
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54# Tel. : 33 (0) 1 40 51 22 26
55# FAX : 33 (0) 1 40 51 22 91
56# Internet : services.iers@obspm.fr |
57#
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63# Paris, 28 June 2007
64# Bulletin C 34
65# To authorities responsible
66# for the measurement and
67# distribution of time
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| 58# Paris, 28 June 2007 |
59#
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69# INFORMATION ON UTC - TAI
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| 60# Bulletin C 34 |
61#
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62# To authorities responsible
63# for the measurement and
64# distribution of time
65#
66# INFORMATION ON UTC - TAI
67# |
68# NO positive leap second will be introduced at the end of December 2007.
69# The difference between Coordinated Universal Time UTC and the
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73# International Atomic Time TAI is:
74# from 2006 January 1, 0h UTC, until further notice : UTC-TAI = -33 s
75# Leap seconds can be introduced in UTC at the end of the months of
76# December or June, depending on the evolution of UT1-TAI. Bulletin C is
77# mailed every six months, either to announce a time step in UTC, or to
78# confirm that there will be no time step at the next possible date.
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| 70# International Atomic Time TAI is : |
71#
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80# Daniel GAMBIS
81# Director
82# Earth Orientation Center of IERS
83# Observatoire de Paris, France
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72# from 2006 January 1, 0h UTC, until further notice : UTC-TAI = -33 s
73#
74# Leap seconds can be introduced in UTC at the end of the months of December
75# or June, depending on the evolution of UT1-TAI. Bulletin C is mailed every
76# six months, either to announce a time step in UTC, or to confirm that there
77# will be no time step at the next possible date.
78#
79# Daniel GAMBIS
80# Director
81# Earth Orientation Center of IERS
82# Observatoire de Paris, France |
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