And once you can convert any Gregorian date to/from a lunar date (i.e. a position in that cycle) (also very doable), Computus becomes simple
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It could be that all the stuff I'm referring to exists in history books, not so much online. I am not a good historian.
It could also be that the Gregorian <-> lunar conversion *is* harder when all you have is a pencil and paper. I forget about that sometimes
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Actually, this is available online - since the Christian lunar calendar is the same as the Jewish one; https://en.wikibooks.org/wiki/Mathematics_of_the_Jewish_Calendar …
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It's a 19 year cycle, with multiple lengths possible for months. It's messy. But Gauss made Passover "easy"; https://en.wikibooks.org/wiki/Mathematics_of_the_Jewish_Calendar/Gauss%27_Formula_for_the_Date_of_Pesach …
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