@Fuego Let me know if you have questions about it. Ive done it a few times.
@Fuego Biggest hurdles:
Lunar and solar _will_ be out of sync. Pick one.
Tropical and sidereal _will_ be out of sync. Pick one.
The length of a month on a lunar calendar is horribly irregular; the Hebrew moment is the most accurate measure of it.
The length of a year on a solar calendar has to account for leap time to stay in sync. Leap day/week/month calculations are incredibly complex. I have spreadsheets and they still suck.
@literorrery that did actually solve a lot of my implicit problems hahaha