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Page 252 At this point, the new pattern is disrupted, and the old pattern is re-established. The source year is now past the year 1900, and the single 50-year difference cycle is in place again. 1903 1953 50 5 1907 1957 50 3 1911 1961 50 1 1915 1965 50 6 1919 1969 50 4 1923 1973 50 2 1927 1977 50 7 1931 1981 50 5 1935 1985 50 3 1939 1989 50 1 1943 1993 50 6 1947 1997 50 4 1951 2001 50 2 The target year has passed a year evenly divisible by 100, which is the year 2000. In this case, however, the year is also evenly divisible by 400, so it is a leap year by the Gregorian rule, thus preventing a disruption in the cycle. The cycle thus continues without change until the target year passes the year 2100, which is evenly divisible by 100 but not 400, and thus disrupts the cycle again. Table 9.4 Using JD#s to find matching DOWs. Source Date Source JD# Target date Target JD# JD# Difference 1826 FEB 28 2,388,051 1876 FEB 28 2,406,313 18,262 1876 FEB 29 2,406,314 1826 MAR 01 2,388,052 1876 MAR 01 2,406,315 18,263 1826 DEC 31 2,388,357 1876 DEC 31 2,406,620 18,263 1827 JAN 01 2,388,358 1877 JAN 01 2,406,621 18,263 1827 DEC 31 2,388,722 1877 DEC 31 2,406,985 18,263 1828 JAN 01 2,388,723 1878 JAN 01 2,406,986 18,263 1828 FEB 28 2,388,781 1878 FEB 28 2,407,044 18,263 1828 FEB 29 2,388,782 1828 MAR 01 2,388,783 1878 MAR 01 2,407,045 18,262
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