Easter may be humanity's chronologically earliest coding horror
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Much is made of the lunar calendar's fine attempt to approximate 365.2425-day Gregorian years. It doesn't do this! It uses 365-day years
Just subtracting all the leap days out of the Gregorian calendar makes converting to the lunar calendar unimaginably simpler
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Then there are epacts. Epacts require big, horrible, impermanent tables both to compute and to interpret. They are also absolutely unneeded
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The epact of any given year is the "age of the moon [i.e. day of the lunar month] on 1 January". But sometimes it's 30 when it should be 29
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