It only comes out to 364 days so you’ll still need to handle that 1.25 extra days in a year otherwise it’ll drift. You could just add December 29th as a special day past Saturday, but then you lose sync with the moon, eg.if New moon was on Sunday the first in the previous year, New moon would be on December 29th instead of on Jan 1st the next year and all new moons would be on the 28th.
You can keep your calendar in sync with the moon or the sun but not both.
It only comes out to 364 days so you’ll still need to handle that 1.25 extra days in a year otherwise it’ll drift. You could just add December 29th as a special day past Saturday, but then you lose sync with the moon, eg.if New moon was on Sunday the first in the previous year, New moon would be on December 29th instead of on Jan 1st the next year and all new moons would be on the 28th.
You can keep your calendar in sync with the moon or the sun but not both.