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The original Roman calendar was based on lunar-solar calendars, and they don't line up with a solar year, because a moon cycle is 29.5 days, not 28. The Jewish
by codexb 3y ago
The original Roman calendar was based on lunar-solar calendars, and they don't line up with a solar year, because a moon cycle is 29.5 days, not 28. The Jewish calendar is one such calendar. It's why Jewish holidays vary so much. Some Christian holidays are based around moon cycles, like Easter. All lunar-solar calendars get around this problem by adding an extra month every few years.
- smegger001 3y agoWell sort of. Christian holidays were originally based on the same cycle as the Jewish Holidays but then the church fathers didn't like having to go ask the nearest Rabbi when their holidays were and tried to do it algorithmicly with absolutely no consoltation with anyone that knew anything about time keeping or astronomy and invented the ecclesiastical equinox (always March 21), and ecclesiastical full moon, neither of which bares relation to any astronomical event.