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93 lines
3.0 KiB
Plaintext
93 lines
3.0 KiB
Plaintext
# @(#)leapseconds 7.20
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# Allowance for leapseconds added to each timezone file.
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# The International Earth Rotation Service periodically uses leap seconds
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# to keep UTC to within 0.9 s of UT1
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# (which measures the true angular orientation of the earth in space); see
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# Terry J Quinn, The BIPM and the accurate measure of time,
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# Proc IEEE 79, 7 (July 1991), 894-905.
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# There were no leap seconds before 1972, because the official mechanism
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# accounting for the discrepancy between atomic time and the earth's rotation
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# did not exist until the early 1970s.
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# The correction (+ or -) is made at the given time, so lines
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# will typically look like:
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# Leap YEAR MON DAY 23:59:60 + R/S
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# or
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# Leap YEAR MON DAY 23:59:59 - R/S
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# If the leapsecond is Rolling (R) the given time is local time
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# If the leapsecond is Stationary (S) the given time is UTC
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# Leap YEAR MONTH DAY HH:MM:SS CORR R/S
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Leap 1972 Jun 30 23:59:60 + S
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Leap 1972 Dec 31 23:59:60 + S
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Leap 1973 Dec 31 23:59:60 + S
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Leap 1974 Dec 31 23:59:60 + S
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Leap 1975 Dec 31 23:59:60 + S
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Leap 1976 Dec 31 23:59:60 + S
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Leap 1977 Dec 31 23:59:60 + S
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Leap 1978 Dec 31 23:59:60 + S
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Leap 1979 Dec 31 23:59:60 + S
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Leap 1981 Jun 30 23:59:60 + S
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Leap 1982 Jun 30 23:59:60 + S
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Leap 1983 Jun 30 23:59:60 + S
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Leap 1985 Jun 30 23:59:60 + S
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Leap 1987 Dec 31 23:59:60 + S
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Leap 1989 Dec 31 23:59:60 + S
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Leap 1990 Dec 31 23:59:60 + S
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Leap 1992 Jun 30 23:59:60 + S
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Leap 1993 Jun 30 23:59:60 + S
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Leap 1994 Jun 30 23:59:60 + S
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Leap 1995 Dec 31 23:59:60 + S
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Leap 1997 Jun 30 23:59:60 + S
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Leap 1998 Dec 31 23:59:60 + S
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Leap 2005 Dec 31 23:59:60 + S
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# INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS)
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#
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# SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE
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#
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# SERVICE DE LA ROTATION TERRESTRE
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# OBSERVATOIRE DE PARIS
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# 61, Av. de l'Observatoire 75014 PARIS (France)
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# Tel. : 33 (0) 1 40 51 22 26
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# FAX : 33 (0) 1 40 51 22 91
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# ...
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# http://hpiers.obspm.fr/eop-pc
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#
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# Paris, 4 July 2005
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#
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# Bulletin C 30
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#
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# To authorities responsible
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# for the measurement and
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# distribution of time
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#
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#
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# UTC TIME STEP
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# on the 1st of January 2006
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#
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# A positive leap second will be introduced at the end of December 2005.
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# The sequence of dates of the UTC second markers will be:
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#
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# 2005 December 31, 23h 59m 59s
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# 2005 December 31, 23h 59m 60s
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# 2006 January 1, 0h 0m 0s
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#
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# The difference between UTC and the International Atomic Time TAI is:
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#
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# from 1999 January 1, 0h UTC, to 2006 January 1 0h UTC : UTC-TAI = - 32s
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# from 2006 January 1, 0h UTC, until further notice : UTC-TAI = - 33s
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#
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# Leap seconds can be introduced in UtC at the end of the months of December
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# or June, depending on the evolution of UT1-TAI. Bulletin C is mailed every
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# six months, either to announce a time step in UTC or to confirm that there
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# will be no time step at the next possible date.
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#
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# Daniel GAMBIS
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# Head
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# Earth Orientation Center of IERS
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# Observatoire de Paris, France
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