In this case each year has twelve months with a thirteenth intercalary, embolismic, or leap month inserted every second or third year.
With a thirteenth intercalary, embolismic, or leap month inserted every second or third year. In this case each year has twelve months.
In this case each year has twelve months. With a thirteenth intercalary, embolismic, or leap month inserted every second or third year.
In this case each year has twelve months. With a thirteenth intercalary, embolismic, or leap month inserted every second or third year.