Pope Gregory XIII (13 mai 1572 – 10 avr. 1585)

Description:

The Julian calendar year was actually a little more than 11 minutes and 14 seconds longer than the true solar year. Thus, by the 16th century a discrepancy of ten full days had accumulated. In 1582 C.E., Pope Gregory XIII introduced a slight revision of the Julian calendar, whereby the leap years every four years were retained but with the exception that only those century years with a number divisible by 400 were to be counted as leap years. By papal bull in 1582, ten days were to be omitted in that year, so that the day after October 4 became October 15. The Gregorian calendar is now in general use in most parts of the world. It is the basis for the historical dates used throughout this publication.

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However, in the course of time, it was found that the Julian calendar year is actually a little more than 11 minutes longer than the true solar year. By the 16th century C.E., a discrepancy of ten full days had accumulated. Thus, in 1582, Pope Gregory XIII introduced a slight revision, instituting what is now known as the Gregorian calendar. By papal bull ten days were omitted from the year 1582, so that the day after October 4 became October 15. The Gregorian calendar provides that centuries not divisible by 400 are not to be considered leap years. For example, unlike the year 2000, the year 1900 was not made a leap year because the number 1,900 is not divisible by 400. The Gregorian calendar is now the one in general use in most parts of the world.

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