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The doubling of the 6th day before Kalendae of March is the origin of the word bissextile.
If we create a list of equivalences between the Roman days and our current days of February in a leap year, we get the following: Since the leap day was the “6th day before Kalendae of March”, either 24 or 25 February is still today frequently considered the leap day.
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Why did Caesar choose to double the 6th day before Kalendae of March?
According to some sources the leap month Intercalaris/Mercedonius of the pre-reform calendar was not placed after February, but inside it, namely between the 7th and 6th day before Kalendae of March.
In an 8 year period the length of the years were: A total of 2930 days corresponding to an average of 366¼ days per year.It was therefore natural to have the leap day in the same position.Roscoe Lamont: The Roman Calendar and its Reformation by Julius Caesar, Popular Astronomy 27 (1919), pp. The length of the months from 45 BC onward were the same as the ones we know today.Occasionally one reads the following story: “Julius Caesar made all odd numbered months 31 days long, and all even numbered months 30 days long (with February having 29 days in non-leap years).