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he Roman calendar has the same months and month lengths as the Julian calendar, but inserts leap days according to a different rule
Most people think there are 12 months in a Julian calender but, THEY ARE WRONG that's a Gregorian calender the calender we use now is a Gregorian calender that has 12 months. Not a Julian calender a Julian calender only has 10 months. The months used to be mean numbers and go in number order. Until 2 people added there own months and messed the calender up. Which created the Gregorian calender
The twelve months in the Gregorian year are January, February, March, April, May, June, July, August, September, October, November, and December. They are exactly the same months as the months in the Julian Year. The difference between the Gregorian Calendar and the Julian Calendars have to do with the calculation of leap years. In The Gregorian Calendar, leap years do not occur in years ending in 00 unless the number preceding the 00 is divisible by 4. This keeps the calendar the same for sunrise and sunset at about the same throughout the year. The Julian Calendar makes no exception for the difference in the difference between the slight difference between the solar year and the calendar year. It is far easier for a computer to calculate dates for ancient astronomical phenomena using a Julian Calendar than using a Gregorian Calendar. It is of course then quite easy for a computer to translate the date to a Gregorian Date.
No, in the Julian calendar used in ancient Rome, a year originally consisted of 10 months. However, later two more months (January and February) were added, making the calendar year consist of 12 months.
The Julian calendar is 13 days behind the Gregorian calendar from March 1900 until March 2100.