The Sidereal Trinary Calendar
Every time the moon goes around the earth, the earth turns around (3x3x3) or 27 times. Every two times the earth goes around the sun, the moon goes around the earth (3x3x3) or 27 times.

One sidereal month = 27 or (3x3x3) days

Two years = 27 months or (3x3x3x3x3x3) days.

The simplest possible calendar would be based on 3.

This calendar would have

3 hours per day

3 days per week

3 weeks per month

3 months per season

3 seasons per year

and 3 years every 2 times the earth goes around the sun.

Website:
Pat's cool website

If you use this calendar you will have no more problems.