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<h2><em>The Gregorian Calendar</em></h2> <h1>THE REVOLUTION<br /> OF TIME</h1>

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The Gregorian Calendar

THE REVOLUTION
OF TIME

G

Gregory XIII is the Pope to whom we owe the reform of the calendar, which from that point on was called the “Gregorian Calendar”, replacing the “Julian Calendar” attributed to Julius Caesar. Gregory XIII gathered a group of mathematicians and scholars, among which were Luigi Lilio and Ignazio Danti, to find a way to recover an error that, over time, was causing incongruity in the recurrence of the seasons.

Roman painter, Japanese Ambassador Tenshō with Pope Gregory XIII

Roman painter, Japanese Ambassador Tenshō with Pope Gregory XIII on March 23rd 1585

To this end, the days between October 4th and 5th 1582 were eliminated and the leap year was introduced. The new Gregorian Calendar was immediately adopted by all Catholic countries but was opposed in many others as it was interpreted as an act of Papal Empire.

Discussion of the calendar reform

Discussion of the calendar reform under Pope Gregory XIII (1502-85) replaced by the Gregorian Calendar, Rome, October 15th 1582
La rivoluzione del tempo

Some countries adopted it very late, such as Sweden in 1741 or Tsarist Russia which chose it only after the Revolution. It is for this reason that the bizarre fact that the so-called “October Revolution” actually happened, for the rest of the world, in November.