Hot answers tagged kiddush-hachodesh
The Rambam is trying to explain how the end of the year "drifts" across the days of the week. The lunar year (twelve lunar months) is roughly 354.3 days. 350 is divisible by seven (hence "groups of seven"), so the only thing that decides what day of the week the year ends on is the remainder. --- the extra 4.3 days. Thus, if the end of the previous year ...
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