Values of DeltaT = ET - UT at 0h UT of the date (specified as day, month, year) from The Astronomical Almanac 1999, pages K8-9 http://maia.usno.navy.mil/ser7/deltat.data ---------------------------------------------- 1 1 1800 13.7 1 1 1801 13.4 1 1 1802 13.1 1 1 1803 12.9 1 1 1804 12.7 1 1 1805 12.6 1 1 1806 12.5 1 1 1807 12.5 1 1 1808 12.5 1 1 1809 12.5 1 1 1810 12.5 1 1 1811 12.5 1 1 1812 12.5 1 1 1813 12.5 1 1 1814 12.5 1 1 1815 12.5 1 1 1816 12.5 1 1 1817 12.4 1 1 1818 12.3 1 1 1819 12.2 1 1 1820 12.0 1 1 1821 11.7 1 1 1822 11.4 1 1 1823 11.1 1 1 1824 10.6 1 1 1825 10.2 1 1 1826 9.6 1 1 1827 9.1 1 1 1828 8.6 1 1 1829 8.0 1 1 1830 7.5 1 1 1831 7.0 1 1 1832 6.6 1 1 1833 6.3 1 1 1834 6.0 1 1 1835 5.8 1 1 1836 5.7 1 1 1837 5.6 1 1 1838 5.6 1 1 1839 5.6 1 1 1840 5.7 1 1 1841 5.8 1 1 1842 5.9 1 1 1843 6.1 1 1 1844 6.2 1 1 1845 6.3 1 1 1846 6.5 1 1 1847 6.6 1 1 1848 6.8 1 1 1849 6.9 1 1 1850 7.1 1 1 1851 7.2 1 1 1852 7.3 1 1 1853 7.4 1 1 1854 7.5 1 1 1855 7.6 1 1 1856 7.7 1 1 1857 7.7 1 1 1858 7.8 1 1 1859 7.8 1 1 1860 7.88 1 1 1861 7.82 1 1 1862 7.54 1 1 1863 6.97 1 1 1864 6.40 1 1 1865 6.02 1 1 1866 5.41 1 1 1867 4.10 1 1 1868 2.92 1 1 1869 1.81 1 1 1870 1.61 1 1 1871 0.10 1 1 1872 -1.02 1 1 1873 -1.28 1 1 1874 -2.69 1 1 1875 -3.24 1 1 1876 -3.64 1 1 1877 -4.54 1 1 1878 -4.71 1 1 1879 -5.11 1 1 1880 -5.40 1 1 1881 -5.42 1 1 1882 -5.20 1 1 1883 -5.46 1 1 1884 -5.46 1 1 1885 -5.79 1 1 1886 -5.63 1 1 1887 -5.64 1 1 1888 -5.80 1 1 1889 -5.66 1 1 1890 -5.87 1 1 1891 -6.01 1 1 1892 -6.19 1 1 1893 -6.64 1 1 1894 -6.44 1 1 1895 -6.47 1 1 1896 -6.09 1 1 1897 -5.76 1 1 1898 -4.66 1 1 1899 -3.74 1 1 1900 -2.72 1 1 1901 -1.54 1 1 1902 -0.02 1 1 1903 1.24 1 1 1904 2.64 1 1 1905 3.86 1 1 1906 5.37 1 1 1907 6.14 1 1 1908 7.75 1 1 1909 9.13 1 1 1910 10.46 1 1 1911 11.53 1 1 1912 13.36 1 1 1913 14.65 1 1 1914 16.01 1 1 1915 17.20 1 1 1916 18.24 1 1 1917 19.06 1 1 1918 20.25 1 1 1919 20.95 1 1 1920 21.16 1 1 1921 22.25 1 1 1922 22.41 1 1 1923 23.03 1 1 1924 23.49 1 1 1925 23.62 1 1 1926 23.86 1 1 1927 24.49 1 1 1928 24.34 1 1 1929 24.08 1 1 1930 24.02 1 1 1931 24.00 1 1 1932 23.87 1 1 1933 23.95 1 1 1934 23.86 1 1 1935 23.93 1 1 1936 23.73 1 1 1937 23.92 1 1 1938 23.96 1 1 1939 24.02 1 1 1940 24.33 1 1 1941 24.83 1 1 1942 25.30 1 1 1943 25.70 1 1 1944 26.24 1 1 1945 26.77 1 1 1946 27.28 1 1 1947 27.78 1 1 1948 28.25 1 1 1949 28.71 1 1 1950 29.15 1 1 1951 29.57 1 1 1952 29.97 1 1 1953 30.36 1 1 1954 30.72 1 1 1955 31.07 1 1 1956 31.35 1 1 1957 31.68 1 1 1958 32.18 1 1 1959 32.68 1 1 1960 33.15 1 1 1961 33.59 1 1 1962 34.00 1 1 1963 34.47 1 1 1964 35.03 1 1 1965 35.73 1 1 1966 36.54 1 1 1967 37.43 1 1 1968 38.29 1 1 1969 39.20 1 1 1970 40.18 1 1 1971 41.17 1 1 1972 42.23 1 7 1972 42.80 1 1 1973 43.37 1 2 1973 43.4724 1 3 1973 43.5648 1 4 1973 43.6737 1 5 1973 43.7782 1 6 1973 43.8763 1 7 1973 43.9562 1 8 1973 44.0315 1 9 1973 44.1132 1 10 1973 44.1982 1 11 1973 44.2952 1 12 1973 44.3936 1 1 1974 44.4841 1 2 1974 44.5646 1 3 1974 44.6425 1 4 1974 44.7386 1 5 1974 44.8370 1 6 1974 44.9302 1 7 1974 44.9986 1 8 1974 45.0584 1 9 1974 45.1284 1 10 1974 45.2064 1 11 1974 45.2980 1 12 1974 45.3897 1 1 1975 45.4761 1 2 1975 45.5633 1 3 1975 45.6450 1 4 1975 45.7375 1 5 1975 45.8284 1 6 1975 45.9133 1 7 1975 45.9820 1 8 1975 46.0408 1 9 1975 46.1067 1 10 1975 46.1825 1 11 1975 46.2789 1 12 1975 46.3713 1 1 1976 46.4567 1 2 1976 46.5445 1 3 1976 46.6311 1 4 1976 46.7302 1 5 1976 46.8284 1 6 1976 46.9247 1 7 1976 46.9970 1 8 1976 47.0709 1 9 1976 47.1451 1 10 1976 47.2362 1 11 1976 47.3413 1 12 1976 47.4319 1 1 1977 47.5214 1 2 1977 47.6049 1 3 1977 47.6837 1 4 1977 47.7781 1 5 1977 47.8771 1 6 1977 47.9687 1 7 1977 48.0348 1 8 1977 48.0942 1 9 1977 48.1608 1 10 1977 48.2460 1 11 1977 48.3439 1 12 1977 48.4355 1 1 1978 48.5344 1 2 1978 48.6325 1 3 1978 48.7294 1 4 1978 48.8365 1 5 1978 48.9353 1 6 1978 49.0319 1 7 1978 49.1013 1 8 1978 49.1591 1 9 1978 49.2286 1 10 1978 49.3070 1 11 1978 49.4018 1 12 1978 49.4945 1 1 1979 49.5862 1 2 1979 49.6805 1 3 1979 49.7602 1 4 1979 49.8556 1 5 1979 49.9489 1 6 1979 50.0347 1 7 1979 50.1019 1 8 1979 50.1622 1 9 1979 50.2260 1 10 1979 50.2968 1 11 1979 50.3831 1 12 1979 50.4599 1 1 1980 50.5387 1 2 1980 50.6161 1 3 1980 50.6866 1 4 1980 50.7658 1 5 1980 50.8454 1 6 1980 50.9187 1 7 1980 50.9761 1 8 1980 51.0278 1 9 1980 51.0843 1 10 1980 51.1538 1 11 1980 51.2319 1 12 1980 51.3063 1 1 1981 51.3808 1 2 1981 51.4526 1 3 1981 51.5160 1 4 1981 51.5985 1 5 1981 51.6809 1 6 1981 51.7573 1 7 1981 51.8133 1 8 1981 51.8532 1 9 1981 51.9014 1 10 1981 51.9603 1 11 1981 52.0328 1 12 1981 52.0985 1 1 1982 52.1668 1 2 1982 52.2316 1 3 1982 52.2938 1 4 1982 52.3680 1 5 1982 52.4465 1 6 1982 52.5180 1 7 1982 52.5752 1 8 1982 52.6178 1 9 1982 52.6668 1 10 1982 52.7340 1 11 1982 52.8056 1 12 1982 52.8792 1 1 1983 52.9565 1 2 1983 53.0445 1 3 1983 53.1268 1 4 1983 53.2197 1 5 1983 53.3024 1 6 1983 53.3747 1 7 1983 53.4335 1 8 1983 53.4778 1 9 1983 53.5300 1 10 1983 53.5845 1 11 1983 53.6523 1 12 1983 53.7256 1 1 1984 53.7882 1 2 1984 53.8367 1 3 1984 53.8830 1 4 1984 53.9443 1 5 1984 54.0042 1 6 1984 54.0536 1 7 1984 54.0856 1 8 1984 54.1084 1 9 1984 54.1463 1 10 1984 54.1914 1 11 1984 54.2452 1 12 1984 54.2958 1 1 1985 54.3427 1 2 1985 54.3911 1 3 1985 54.4320 1 4 1985 54.4898 1 5 1985 54.5456 1 6 1985 54.5977 1 7 1985 54.6355 1 8 1985 54.6532 1 9 1985 54.6776 1 10 1985 54.7174 1 11 1985 54.7741 1 12 1985 54.8253 1 1 1986 54.8713 1 2 1986 54.9161 1 3 1986 54.9581 1 4 1986 54.9997 1 5 1986 55.0476 1 6 1986 55.0912 1 7 1986 55.1132 1 8 1986 55.1328 1 9 1986 55.1532 1 10 1986 55.1898 1 11 1986 55.2416 1 12 1986 55.2838 1 1 1987 55.3222 1 2 1987 55.3613 1 3 1987 55.4063 1 4 1987 55.4629 1 5 1987 55.5111 1 6 1987 55.5524 1 7 1987 55.5812 1 8 1987 55.6004 1 9 1987 55.6262 1 10 1987 55.6656 1 11 1987 55.7168 1 12 1987 55.7698 1 1 1988 55.8197 1 2 1988 55.8615 1 3 1988 55.9130 1 4 1988 55.9663 1 5 1988 56.0220 1 6 1988 56.0700 1 7 1988 56.0939 1 8 1988 56.1105 1 9 1988 56.1314 1 10 1988 56.1611 1 11 1988 56.2068 1 12 1988 56.2583 1 1 1989 56.3000 1 2 1989 56.3399 1 3 1989 56.3790 1 4 1989 56.4283 1 5 1989 56.4804 1 6 1989 56.5352 1 7 1989 56.5697 1 8 1989 56.5983 1 9 1989 56.6328 1 10 1989 56.6739 1 11 1989 56.7332 1 12 1989 56.7972 1 1 1990 56.8553 1 2 1990 56.9111 1 3 1990 56.9755 1 4 1990 57.0471 1 5 1990 57.1136 1 6 1990 57.1738 1 7 1990 57.2226 1 8 1990 57.2597 1 9 1990 57.3073 1 10 1990 57.3643 1 11 1990 57.4334 1 12 1990 57.5016 1 1 1991 57.5653 1 2 1991 57.6333 1 3 1991 57.6973 1 4 1991 57.7711 1 5 1991 57.8407 1 6 1991 57.9058 1 7 1991 57.9576 1 8 1991 57.9975 1 9 1991 58.0426 1 10 1991 58.1043 1 11 1991 58.1679 1 12 1991 58.2389 1 1 1992 58.3092 1 2 1992 58.3833 1 3 1992 58.4537 1 4 1992 58.5401 1 5 1992 58.6228 1 6 1992 58.6917 1 7 1992 58.7410 1 8 1992 58.7836 1 9 1992 58.8406 1 10 1992 58.8986 1 11 1992 58.9714 1 12 1992 59.0438 1 1 1993 59.1218 1 2 1993 59.2003 1 3 1993 59.2747 1 4 1993 59.3574 1 5 1993 59.4434 1 6 1993 59.5242 1 7 1993 59.5850 1 8 1993 59.6344 1 9 1993 59.6928 1 10 1993 59.7588 1 11 1993 59.8386 1 12 1993 59.9111 1 1 1994 59.9845 1 2 1994 60.0564 1 3 1994 60.1231 1 4 1994 60.2042 1 5 1994 60.2804 1 6 1994 60.3530 1 7 1994 60.4012 1 8 1994 60.4440 1 9 1994 60.4900 1 10 1994 60.5578 1 11 1994 60.6324 1 12 1994 60.7059 1 1 1995 60.7853 1 2 1995 60.8664 1 3 1995 60.9387 1 4 1995 61.0277 1 5 1995 61.1103 1 6 1995 61.1870 1 7 1995 61.2454 1 8 1995 61.2881 1 9 1995 61.3378 1 10 1995 61.4036 1 11 1995 61.4760 1 12 1995 61.5525 1 1 1996 61.6287 1 2 1996 61.6846 1 3 1996 61.7433 1 4 1996 61.8132 1 5 1996 61.8823 1 6 1996 61.9497 1 7 1996 61.9969 1 8 1996 62.0343 1 9 1996 62.0714 1 10 1996 62.1202 1 11 1996 62.1810 1 12 1996 62.2382 1 1 1997 62.2950 1 2 1997 62.3506 1 3 1997 62.3995 1 4 1997 62.4754 1 5 1997 62.5463 1 6 1997 62.6136 1 7 1997 62.6571 1 8 1997 62.6942 1 9 1997 62.7383 1 10 1997 62.7926 1 11 1997 62.8567 1 12 1997 62.9146 1 1 1998 62.9659 1 2 1998 63.0217 1 3 1998 63.0807 1 4 1998 63.1462 1 5 1998 63.2053 1 6 1998 63.2599 1 7 1998 63.2844 1 8 1998 63.2961 1 9 1998 63.3126 1 10 1998 63.3422 1 11 1998 63.3871 1 12 1998 63.4339 1 1 1999 63.4673 1 2 1999 63.4979 1 3 1999 63.5319 1 4 1999 63.5679 1 5 1999 63.6104 1 6 1999 63.6444 1 7 1999 63.6642 1 8 1999 63.6739 1 9 1999 63.6926 1 10 1999 63.7147 1 11 1999 63.7518 1 12 1999 63.7927 1 1 2000 63.8285 1 2 2000 63.8557 1 3 2000 63.8804 1 4 2000 63.9075 1 5 2000 63.9393 1 6 2000 63.9691 1 7 2000 63.9799 1 8 2000 63.9833 1 9 2000 63.9938 1 10 2000 64.0093 1 11 2000 64.0400 1 12 2000 64.0670 1 1 2001 64.0908 1 2 2001 64.1068 1 3 2001 64.1282 1 4 2001 64.1584 1 5 2001 64.1833 1 6 2001 64.2094 1 7 2001 64.2117 1 8 2001 64.2073 1 9 2001 64.2116 1 10 2001 64.2223 1 11 2001 64.2500 1 12 2001 64.2761 1 1 2002 64.2998 1 2 2002 64.3192 1 3 2002 64.3450 1 4 2002 64.3735 1 5 2002 64.3943 1 6 2002 64.4151 1 7 2002 64.4132 1 8 2002 64.4118 1 9 2002 64.4097 1 10 2002 64.4168 1 11 2002 64.4329 1 12 2002 64.4511 1 1 2003 64.4734 1 2 2003 64.4893 1 3 2003 64.5053 1 4 2003 64.5269 1 5 2003 64.5471 1 6 2003 64.5597 1 7 2003 64.5512 1 8 2003 64.5371 1 9 2003 64.5359 1 10 2003 64.5415 1 11 2003 64.5544 1 12 2003 64.5654 1 1 2004 64.5736 1 2 2004 64.5891 1 3 2004 64.6015 1 4 2004 64.6176 1 5 2004 64.6374 1 6 2004 64.6549 1 7 2004 64.6530 1 8 2004 64.6379 1 9 2004 64.6372 1 10 2004 64.6400 1 11 2004 64.6543 1 12 2004 64.6723 1 1 2005 64.6876 1 2 2005 64.7052 1 3 2005 64.7313 1 4 2005 64.7575 1 5 2005 64.7811 1 6 2005 64.8001 1 7 2005 64.7995 1 8 2005 64.7876 1 9 2005 64.7831 1 10 2005 64.7921 1 11 2005 64.8096 1 12 2005 64.8311 1 1 2006 64.8452 1 2 2006 64.8597 1 3 2006 64.8850 1 4 2006 64.9175 1 5 2006 64.9480 1 6 2006 64.9794 1 7 2006 64.9895 1 8 2006 65.0028 1 9 2006 65.0138 1 10 2006 65.0371 1 11 2006 65.0773 1 12 2006 65.1122 1 1 2007 65.1464 1 2 2007 65.1833 1 3 2007 65.2145 1 4 2007 65.2494 1 5 2007 65.2921 1 6 2007 65.3279 1 7 2007 65.3413 1 8 2007 65.3452 1 9 2007 65.3496 1 10 2007 65.3711 1 11 2007 65.3972 1 12 2007 65.4296 1 1 2008 65.4573 1 2 2008 65.4868 1 3 2008 65.5152 1 4 2008 65.5450 1 5 2008 65.5781 1 6 2008 65.6127 1 7 2008 65.6288 1 8 2008 65.6370 1 9 2008 65.6493 1 10 2008 65.6760 1 11 2008 65.7097 1 12 2008 65.7461 1 1 2009 65.7768 1 2 2009 65.8025 1 3 2009 65.8237 1 4 2009 65.8595 1 5 2009 65.8973 1 6 2009 65.9323 1 7 2009 65.9509 1 8 2009 65.9534 1 9 2009 65.9628 1 10 2009 65.9839 1 11 2009 66.0147 1 12 2009 66.0420 1 1 2010 66.0699 1 2 2010 66.0961 1 3 2010 66.1310 1 4 2010 66.1683 1 5 2010 66.2072 1 6 2010 66.2356 1 7 2010 66.2409 1 8 2010 66.2335 1 9 2010 66.2349 1 10 2010 66.2441 1 11 2010 66.2751 1 12 2010 66.3054 1 1 2011 66.3246 1 2 2011 66.3406 1 3 2011 66.3624 1 4 2011 66.3957 1 5 2011 66.4289 1 6 2011 66.4619 1 7 2011 66.4749 1 8 2011 66.4751 1 9 2011 66.4829 1 10 2011 66.5056 1 11 2011 66.5383 1 12 2011 66.5706 1 1 2012 66.6030 1 2 2012 66.6340 1 3 2012 66.6569 1 4 2012 66.6925 1 5 2012 66.7289 1 6 2012 66.7579 1 7 2012 66.7708 1 8 2012 66.7740 1 9 2012 66.7846 1 10 2012 66.8103 1 11 2012 66.8400 1 12 2012 66.8779 1 1 2013 66.9069 1 2 2013 66.9443 1 3 2013 66.9763 1 4 2013 67.0258 1 5 2013 67.0716 1 6 2013 67.1100 1 7 2013 67.1266 1 8 2013 67.1331 1 9 2013 67.1458 1 10 2013 67.1717 1 11 2013 67.2091 1 12 2013 67.2460 1 1 2014 67.2810 1 10 2013 67.1718 1 2 2014 67.3136 1 3 2014 67.3457 1 4 2014 67.3890 1 5 2014 67.4318 1 6 2014 67.4666 1 7 2014 67.4858 1 8 2014 67.4989 1 9 2014 67.5111 1 10 2014 67.5353 1 11 2014 67.5711 1 12 2014 67.6070 1 1 2015 67.6439 1 2 2015 67.6765 1 3 2015 67.7117 1 4 2015 67.7591 1 5 2015 67.8011 1 6 2015 67.8402 1 7 2015 67.8606 1 8 2015 67.8822 1 9 2015 67.9120 1 10 2015 67.9547 1 10 2015 67.9546 1 11 2015 68.0055 1 12 2015 68.0514 1 1 2016 68.1024 1 2 2016 68.1577 1 5 2015 67.8012 1 3 2016 68.2044 1 4 2016 68.2665 1 5 2016 68.3188 1 6 2016 68.3703 1 7 2016 68.3964 1 8 2016 68.4094 1 9 2016 68.4305 1 10 2016 68.4630 1 11 2016 68.5078 1 12 2016 68.5537 1 1 2017 68.5928 1 1 2200 68.5928