Ethiopian Monks and Scholars traditionally kept 28 tables of 19-year calculations to reckon time in large blocks of 532 years (1.e. 28 x 19 = 532). Those tables contained calculations of calendrical parameters that ultimately allowed the Ethiopians to Calculate Spring Equinox. The scholars made eight sets of calculations to solve this problem and thus compile these calendrical tables.

These calculations enabled them to calculate the running total number of differences between the 354-day lunar year and the 365-day solar year. These calculations made extensive use of “modulo” arithmetic. Modulo arithmetic is where there is a limit on the highest number that can be calculated from a procedure.

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