Monday, June 5, 2017

calendar - Why do we use Adar, specifically, for the Jewish leap year?



Why when we add an additional month to the year do we only add it in Adar? Why not have a second Cheshvon or a second Shevat, etc.?



Answer



We add the additional month in order to keep Pesach in the spring, as the Torah mandates (Deut. 16:1). So it is added as close to Nissan as possible, in order to make explicit the link between the extra month and its purpose.




Tosafos (Sanhedrin 11b, s.v. אין מעברין) says that since we have verses in Tanach (Esther 3:7 passim) that call Adar the "twelfth month," then necessarily no other month can be inserted before it, otherwise some years it would be the thirteenth.


The Mechilta (Bo 2) cites a different reason: the year should be similar to the month in the way it's extended - in both cases, the extension (a day or a month) comes at the end.


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