Relating to or involving the epact, especially in calculations for determining Easter and other religious observances.
From 'epact' plus the suffix '-al,' meaning 'relating to.' This adjective form emerged as ecclesiastical scholars needed to discuss epact-related calculations in theological texts.
Medieval monks used epactal tables to solve one of history's trickiest scheduling problems—how to calculate Easter consistently across centuries when the moon and sun refuse to cooperate.
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