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Page 251 At this point, the pattern is disrupted. The next cycle would ordinarily be 1851/1901, but the year 1900 is evenly divisible by 100, and not by 400, thus breaking the regular cycle of leap year occurrences. A new pair of cycles is started (Table 9.3). Table 9.3 Disruption in Gregorian cycle. Source Year Target Year Year Difference Year Type Cycle (1 = gray, 2 = white) 1851 1902 51 4 1854 1905 51 1 1855 1906 51 2 1858 1909 51 6 1859 1910 51 7 1862 1913 51 4 1863 1914 51 5 1866 1917 51 2 1867 1918 51 3 1870 1921 51 7 1871 1922 51 1 1874 1925 51 5 1875 1926 51 6 1878 1929 51 3 1879 1930 51 4 1882 1933 51 1 1883 1934 51 2 1886 1937 51 6 1887 1938 51 7 1890 1941 51 4 1891 1942 51 5 1894 1945 51 2 1895 1946 51 3 1898 1949 51 7 1899 1950 51 1
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