Roman calendar dating
It started as a year of 10 lunar months, and soon changed to a lunar year of 12 months.Other enhancements were made to change to solar years, with patchy attempts to add additional days to maintain alignment of seasons.This article is about a calendar used for civil and liturgical purposes.For the day-number calendar used for astronomical and historical calculations, see Julian day. It took effect on 1 January 45 BC (AUC 709), by edict.This year was discovered to be too long, and therefore 7 days were later dropped from the 8th year, yielding 365.375 days per year. In practice it was the duty of the priesthood to keep track of the calendars, but they failed miserably, partly due to ignorance, partly because they were bribed to make certain years long and other years short.Furthermore, leap years were considered unlucky and were therefore avoided in time of crisis, such as the Second Punic War.
In 450 BC, February was moved to its current position between January and March.In years when it was inserted, Mercedinus added 22 or 23 days to the year.