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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.
This may have been done to mimic the lunar cycles or the Zodiac, but there could just as easily have been eight or ten months. There are approximately three-hundred-sixty-five days in a solar calendar, and it must be adjusted with leap days periodically to keep the cycle of days in sync with the cycle of years.