It is here seen by the errors of the Julian Calendar the Vernal Equinox is made to occur three days earlier every 400 years, so that in 1582 it fell on the 11th instead of the 21st of March.

[Larger Image]

By the Gregorian rule of intercalation the coincidence of the solar and civil year is restored very nearly every 400 years. [Appendix I.]

CHAPTER VI.

A SIMPLE METHOD FOR FINDING THE DAY OF THE WEEK OF EVENTS WHICH OCCUR QUADRENNIALLY.

The inaugural of the Presidents. The day of the week on which they have occurred, and on which they will occur for the next one hundred years:

April 30th, 1789,Thursday,George Washington.
March 4th, 1793,Monday,""
""1797,Saturday,John Adams
""1801,Wednesday,Thomas Jefferson.
""1805,Monday,""
""1809,Saturday,James Madison.
""1813,Thursday,""
""1817,Tuesday,James Monroe.
""1821,Sunday,""
""1825,Friday,John Q. Adams.
""1829,Wednesday,Andrew Jackson.
""1833,Monday,""
""1837,Saturday,Martin Van Buren.
""1841,Thursday,Wm. H. Harrison.
""1845,Tuesday,James K. Polk.
""1849,Sunday,Zachary Taylor.
""1853,Friday,Franklin Pierce.
""1857,Wednesday,James Buchanan.
""1861,Monday,Abraham Lincoln.
""1865,Saturday,""
""1869,Thursday,Ulysses S. Grant.
""1873,Tuesday,""
""1877,Sunday,Rutherford B. Hays.
""1881,Friday,James A. Garfield.
""1885,Wednesday,Grover Cleveland.
""1889,Monday,Benjamin Harrison.
""1893,Saturday,Grover Cleveland.
""1897,Thursday,
""1901,Monday,
""1905,Saturday,
""1909,Thursday,
""1913,Tuesday,
""1917,Sunday,
""1921,Friday,
""1925,Wednesday,
""1929,Monday,
""1933,Saturday,
""1937,Thursday,
""1941,Tuesday,
""1945,Sunday,
""1949,Friday,
""1953,Wednesday,
""1957,Monday,
""1961,Saturday,
""1965,Thursday,
""1969,Tuesday,
""1973,Sunday,
""1977,Friday,
""1981,Wednesday,
""1985,Monday,
""1989,Saturday,
""1993,Thursday.