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“Computus” as a book category covers the art and science of calculating sacred time in the Christian tradition—above all the date of Easter—and the broader study of calendars, chronology, and time-reckoning from late antiquity through the early modern period. It includes medieval computistical treatises and tables, the mathematics and astronomy of lunar and solar cycles (e.g., Golden Numbers, epacts, the Metonic cycle), monastic timekeeping, paschal controversies, and reforms such as the shift from the Julian to the Gregorian calendar, alongside modern editions, translations, and scholarly analyses. The category may also encompass comparative studies of calendrical systems and contemporary reconstructions or digital tools that model historical methods. It is aimed at readers in medieval studies, liturgy, history of science, astronomy, and chronology, and is not to be confused with modern computer science.

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