The early Roman calendar was conceived by Romulus, the founder of Rome in the 8th century BCE. Numa Pompilius, who came to power a year later, made it a 12-month year by adding the months of Januarius and Februarius.

But this calendar, which followed the lunar cycle, frequently fell out of sync with the seasons. Moreover, the pontifices, or the member of council of priests assigned with the duty of overseeing the calendar, were often accused of adding days in order to interfere with election dates or extend a political term.

After Julius Caesar came to power in 46 BCE, he attempted to reform the calendar for which he took the advice of Alexandrian astronomer, Sosigenus. Sosigenus suggested doing away with the lunar cycle and following the sun instead, the way the Egyptians did. Accordingly, the year was calculated at 365 and ¼ days.

Interestingly, Caesar added 67 days to the year 46 BCE so that the new year in 45 BCE could begin on January 1. The date was chosen to honour the Roman God of beginnings, Janus, who is believed to have two faces- one looking back into the past and the other to the future. Thereafter, ancient Romans celebrated the day by offering sacrifices to Janus and exchanging gifts with one another. https://december-globalholidays.com/
However, with the spread of Christianity, the celebration of a Roman God was seen as a pagan ritual in many parts of Europe. Accordingly, in medieval Europe Christian leaders attempted to celebrate the beginning of a new year on a day with more religious significance, like December 25 (Christmas) or March 25 (the feast of Annunciation).

There was also an error made by Caesar and Sosigenus in calculating the number of days in a solar year. The actual number of days in a solar calendar is 365.24199 as opposed to the 365.25 that Caesar had calculated. Consequently, there was a gap of 11-minutes every year, which added up to about 11 days by the year 1582. “This defect was of principle concern to the pope; if the Julian calendar had continued in service, Easter would eventually have been celebrated in the summer,” writes historian Gordon Moyer, in his article, ‘The Gregorian calendar’. Thereafter began the effort to standardise a calendar, most suitable to the Christian life of the middle ages.

The calendar made by Pope Gregory XIII
The reform was not easy. Pope Gregory assembled an eminent body of astronomers, mathematicians and clergymen for the purpose. The main challenge it faced was that afflicting almost every civil calendar, that of dealing with a fraction of a dangling at the end of the year.

In order to fix the miscalculation of the Julian calendar, Aloysius Lilius, the Italian scientist who worked on the Gregorian calendar, devised a new system whereby every fourth year would be a leap year, but century years that were not divisible by 400 were exempted. For instance, the years 1600 and 2000 were leap years, but not 1700, 1800 and 1900. These revisions were formally instituted by the papal bull of February 24, 1582, setting off a furious debate among religious leaders and scholars.
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