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The Gregorian calendar was decreed in 1582 by the papal bull Inter gravissimas by Pope Gregory XIII, to correct an error in the Julian calendar that was causing erroneous calculation of the date of Easter.
The reform, which established what became known as the Gregorian calendar and laid down rules for calculating the date of Easter, was well received by such astronomers as Johannes Kepler and Tycho Brahe and by the Catholic princes of Europe.
Although the Gregorian calendar is named after Pope Gregory XIII, it is an adaptation of a calendar designed by Luigi Lilio (also known as Aloysius Lilius), who was an Italian doctor, astronomer, and philosopher.
Dec 7, 2020 · The Gregorian calendar was instituted by Pope Gregory XIII in 1582 and quickly adopted by much of Catholic, but not Protestant, Europe. The reform altered the Julian, or Old Style, system of leap years and, by removing ten days from October 1582, adjusted the timing of the Easter observance so that it better coincided with the spring season.
In 1582 Pope Gregory XIII (hence the name Gregorian Calendar) ordered ten days to be dropped from October, thus restoring the vernalequinox at least to an average of the 20th of March, close to what it had been at the time of the Council of Nicea.
It is named for Pope Gregory XIII, who issued the papal bull Inter gravissimas in 1582, announcing calendar reforms for all of Catholic Christendom. The Gregorian calendar modified the existing Julian calendar, which Julius Caesar had introduced to the ancient Roman Republic in 46 BCE. What is the Gregorian calendar?
May 1, 1982 · May 1, 1982. 1 min read. The Gregorian Calendar. Pope Gregory XIII began the modern calendar 400 years ago in order to correct the accumulating drift in the Julian calendar and keep Easter in...
