1# @(#)leapseconds 7.13
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1# @(#)leapseconds 7.14 |
2
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3# $FreeBSD: head/share/zoneinfo/leapseconds 75267 2001-04-06 16:46:52Z wollman $
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3# $FreeBSD: head/share/zoneinfo/leapseconds 86222 2001-11-09 19:17:59Z wollman $ |
4 5# Allowance for leapseconds added to each timezone file. 6 7# The International Earth Rotation Service periodically uses leap seconds 8# to keep UTC to within 0.9 s of UT1 9# (which measures the true angular orientation of the earth in space); see 10# Terry J Quinn, The BIPM and the accurate measure of time, 11# Proc IEEE 79, 7 (July 1991), 894-905. 12# There were no leap seconds before 1972, because the official mechanism 13# accounting for the discrepancy between atomic time and the earth's rotation 14# did not exist until the early 1970s. 15 16# The correction (+ or -) is made at the given time, so lines 17# will typically look like: 18# Leap YEAR MON DAY 23:59:60 + R/S 19# or 20# Leap YEAR MON DAY 23:59:59 - R/S 21 22# If the leapsecond is Rolling (R) the given time is local time 23# If the leapsecond is Stationary (S) the given time is UTC 24 25# Leap YEAR MONTH DAY HH:MM:SS CORR R/S 26Leap 1972 Jun 30 23:59:60 + S 27Leap 1972 Dec 31 23:59:60 + S 28Leap 1973 Dec 31 23:59:60 + S 29Leap 1974 Dec 31 23:59:60 + S 30Leap 1975 Dec 31 23:59:60 + S 31Leap 1976 Dec 31 23:59:60 + S 32Leap 1977 Dec 31 23:59:60 + S 33Leap 1978 Dec 31 23:59:60 + S 34Leap 1979 Dec 31 23:59:60 + S 35Leap 1981 Jun 30 23:59:60 + S 36Leap 1982 Jun 30 23:59:60 + S 37Leap 1983 Jun 30 23:59:60 + S 38Leap 1985 Jun 30 23:59:60 + S 39Leap 1987 Dec 31 23:59:60 + S 40Leap 1989 Dec 31 23:59:60 + S 41Leap 1990 Dec 31 23:59:60 + S 42Leap 1992 Jun 30 23:59:60 + S 43Leap 1993 Jun 30 23:59:60 + S 44Leap 1994 Jun 30 23:59:60 + S 45Leap 1995 Dec 31 23:59:60 + S 46Leap 1997 Jun 30 23:59:60 + S 47Leap 1998 Dec 31 23:59:60 + S
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48# INTERNATIONAL EARTH ROTATION SERVICE (IERS)
49# SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE
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48 49# INTERNATIONAL EARTH ROTATION SERVICE (IERS) 50# SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE |
51# 52# SERVICE DE LA ROTATION TERRESTRE 53# OBSERVATOIRE DE PARIS 54# 61, Av. de l'Observatoire 75014 PARIS (France) 55# Tel. : 33 (0) 1 40 51 22 26 56# FAX : 33 (0) 1 40 51 22 91 57# Internet : iers@obspm.fr 58#
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58# Paris, 11 January 2001
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59# Paris, 25 June 2001 |
60#
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60# Bulletin C 21
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61# Bulletin C 22 |
62#
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62# To authorities responsible for the measurement and distribution of time
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63# To authorities responsible 64# for the measurement and 65# distribution of time |
66#
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64# INFORMATION ON UTC - TAI
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67# INFORMATION ON UTC - TAI |
68#
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66# NO positive leap second will be introduced at the end of June 2001.
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69# NO positive leap second will be introduced at the end of December 2001. 70# The difference between UTC and the International Atomic Time TAI is : 71# 72# from 1999 January 1, 0h UTC, until further notice : UTC-TAI = -32 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 |
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