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Observed values of UT1-TAI, 1962-1999

TT-UT1 can be obtained from this table using the expression

TT-UT1 = 32.184s - (UT1-TAI)

The uncertainty of UT1-TAI is smaller than 2 units of the last digit listed.

DATEUT1-TAI
(s)
DATEUT1-TAI DATEUT1-TAI DATEUT1-TAI
1962JAN 1
APR 1
JUL 1
OCT 1
-1.813
-1.936
-2.058
-2.142
1972JAN 1
APR 1
JUL 1
OCT 1
-10.045
-10.347
-10.638
-10.888
1982JAN 1
APR 1
JUL 1
OCT 1
-19.983
-20.184
-20.391
-20.550
1992JAN 1
APR 1
JUL 1
OCT 1
-26.1252
-26.3562
-26.5569
-26.7146
1963 JAN 1
APR 1
JUL 1
OCT 1
-2.289
-2.407
-2.551
-2.659
1973JAN 1
APR 1
JUL 1
OCT 1
-11.189
-11.489
-11.771
-12.016
1983JAN 1
APR 1
JUL 1
OCT 1
-20.773
-21.036
-21.250
-21.400
1993JAN 1
APR 1
JUL 1
OCT 1
-26.9378
-27.1734
-27.4010
-27.5748
1964JAN 1
APR 1
JUL 1
OCT 1
-2.847
-3.043
-3.217
-3.350
1974JAN 1
APR 1
JUL 1
OCT 1
-12.301
-12.553
-12.814
-13.023
1984 JAN 1
APR 1
JUL 1
OCT 1
-21.6042
-21.7603
-21.9018
-22.0074
1994JAN 1
APR 1
JUL 1
OCT 1
-27.8004
-28.0202
-28.2171
-28.3738
1965JAN 1
APR 1
JUL 1
OCT 1
-3.558
-3.761
-3.964
-4.139
1975JAN 1
APR 1
JUL 1
OCT 1
-13.292
-13.554
-13.799
-13.999
1985JAN 1
APR 1
JUL 1
OCT 1
-22.1587
-22.3058
-22.4516
-22.5333
1995JAN 1
APR 1
JUL 1
OCT 1
-28.6014
-28.8437
-29.0614
-29.2196
1966JAN 1
APR 1
JUL 1
OCT 1
-4.360
-4.586
-4.817
-5.006
1976JAN 1
APR 1
JUL 1
OCT 1
-14.274
-14.545
-14.812
-15.054
1986 JAN 1
APR 1
JUL 1
OCT 1
-22.6872
-22.8157
-22.9292
-23.0058
1996JAN 1
APR 1
JUL 1
OCT 1
-29.4447
-29.6292
-29.8129
-29.9362
1967 JAN 1
APR 1
JUL 1
OCT 1
-5.248
-5.476
-5.700
-5.871
1977JAN 1
APR 1
JUL 1
OCT 1
-15.336
-15.595
-15.850
-16.062
1987JAN 1
APR 1
JUL 1
OCT 1
-23.1382
-23.2788
-23.3972
-23.4816
1997JAN 1
APR 1
JUL 1
OCT 1
-30.1110
-30.2914
-30.4731
-30.6087
1968JAN 1
APR 1
JUL 1
OCT 1
-6.111
-6.344
-6.573
-6.775
1978JAN 1
APR 1
JUL 1
OCT 1
-16.351
-16.651
-16.917
-17.123
1988JAN 1
APR 1
JUL 1
OCT 1
-23.6356
-23.7823
-23.9100
-23.9771
1998JAN 1
APR 1
JUL 1
OCT 1
-30.7818
-30.9622
-31.1004
-31.1582
1969JAN 1
APR 1
JUL 1
OCT 1
-7.021
-7.274
-7.521
-7.734
1979JAN 1
APR 1
JUL 1
OCT 1
-17.402
-17.670
-17.918
-18.112
1989JAN 1
APR 1
JUL 1
OCT 1
-24.1159
-24.2443
-24.3857
-24.4899
1999JAN 1
APR 1
JUL 1
-31.2833
-31.3840
-31.4801
1970JAN 1
APR 1
JUL 1
OCT 1
-7.997
-8.271
-8.526
-8.722
1980 JAN 1
APR 1
JUL 1
OCT 1
-18.355
-18.582
-18.792
-18.970
1990 JAN 1
APR 1
JUL 1
OCT 1
-24.6713
-24.8631
-25.0386
-25.1803
1971JAN 1
APR 1
JUL 1
OCT 1
-8.985
-9.237
-9.503
-9.741
1981JAN 1
APR 1
JUL 1
OCT 1
-19.196
-19.414
-19.629
-19.777
1991 JAN 1
APR 1
JUL 1
OCT 1
-25.3813
-25.5871
-25.7735
-25.9204

Table provided by the former Central Bureau.

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