The purpose of having Leap Years in the calendar is to correct for rounding errors in counting the number of days in the year. If a 366-day calendar has a leap year every two years where two days are added to the calendar, then the length of the year must be very close to 367 days. In that case, why haven't the priests and other learned people put forth a 367-day calendar and call it done?

Yearly Calendar / Discussion

This is the discussion related to the wiki page Yearly Calendar.