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Change in roman calendar dating

However, every year divisible by 100 is not a leap year.

However, every year divisible by 400 is a leap year after all.

To this day, most of the world uses his Gregorian calendar.

Before today’s Gregorian calendar was adopted, the older Julian calendar was used.

By the time he reformed the Julian calendar in 1582 (using the observations of Christopher Clavius and Johannes Kepler), it had drifted 10 days off course.

It was decreed by Pope Gregory XIII in a papal bull on 24 February 1582.

This bull is named “Inter Gravissimas” after its first two words.

In the Gregorian calendar, the tropical year is approximated as 365 is achieved by having 97 leap years every 400 years.

The Gregorian calendar has 97 leap years every 400 years: Every year divisible by 4 is a leap year.


  1. September through December were the seventh through tenth months of a calendar used by the first Romans. Ancient historian and Greek biographer Plutarch, wrote in C. E. 75, about how they became displaced to two positions higher than their names would indicate.

  2. Sweden decided to make a more gradual change from the Julian to the Gregorian calendar. Instead of taking 11 days out of the calendar in one year, it planned to drop a day every leap year from 1700 through 1740 until the eleven extra days were omitted. By 1740 it would be in line with the new Gregorian calendar and other countries.

  3. The Roman calendar changed its form several times in the time between the foundation of Rome and the fall of the Roman Empire. This article generally discusses the early Roman or 'pre-Julian' calendars.

  4. Notes. Julian dates abbreviated JD are simply a continuous count of days and fractions since noon Universal Time on January 1, 4713 BC on the Julian calendar.

  5. Gregorian calendar, also called New Style Calendar, solar dating system now in general use. It was proclaimed in 1582 by Pope Gregory XIII as a reform of the Julian calendar.

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