Easter may be humanity's chronologically earliest coding horror
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Just subtracting all the leap days out of the Gregorian calendar makes converting to the lunar calendar unimaginably simpler
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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The epact goes up by 11 every year, mod 30. But not always! It also doesn't tell you WHICH lunar month it is
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