Determination of the day of the week not a Gregorian leap year, (but 19 in the Julian column indicates that it "is" a Julian leap year, as are all Julian "x"00 years). 20 indicates that 2000 is a leap year. Use Jan and Feb only in leap years. For determination of the day of the week (1 January 2000, Saturday) For determination of the dominical letter (2000, BA) For determination of the doomsday (2000, Tuesday) Note that the date (and hence the day of the week) in the Revised Julian and Gregorian calendars is the same from 14 October 1923 to 28 February AD 2800 inclusive and
Sabato Morais Sabato Morais Sabato Morais (; April 13, 1823 – November 11, 1897) was an Italian-American rabbi, leader of Mikveh Israel Synagogue, pioneer of Italian Jewish Studies in America, and founder of the Jewish Theological Seminary in New York City. Morais was born in Livorno, Italy. He was the elder son and the third of nine children of Samuel and Bona Morais. The Morais family came originally from Portugal, being probably among the large number of Jews who fled thence from the Inquisition. At the time of Sabato's birth, Italy was in the thick of her great struggle for freedom. Samuel