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Some days were added to certain months, and the total number of days in the year went to 365 from 354. Every fourth year was made a leap year, with an extra day in one month. But there was still a discrepancy between the true year and the Julian calendar year.
The Gregorian solar calendar is an arithmetical calendar. It counts days as the basic unit of time, grouping them into years of 365 or 366 days. The calendar repeats completely every 146,097 days, the cycle consisting of 400 years, of which 303, the common years, have 365 days, and 97, the leap years, have 366 days.