Note 11 — Chapter IV
Reading edition
W. Toone, “The Chronological Historian.”—[When the Julian Calendar was introduced, the Vernal Equinox fell on the 25th of March. At the time of the Council of Nice, A.D. 325, it had retrograded to the 21st of March; and when the reformation was made in 1582, to the 11th of March. Pope Gregory XIII., to restore it to its place, directed ten days to be suppressed in the calendar; and as the use of the Julian intercalation was found to be three days in 400 years, he ordered the intercalation to be omitted in all the centenary years except those which were multiples of 400. According to Gregorian rule, therefore, every year of which the number is divisible by four, without a remainder, is a leap year, excepting the centenary years, which are only leap years when divisible by four, on suppressing the units and tens. Thus—