Commentary: On the Babylonian Talmud, Tractate Rosh Hashanah

When R. Zera ascended [from Babylonia to the land of Israel], he sent [a letter] to them: It is necessary for the night and the day to be of the new month. And this is what Abba, father of R. Simlai, said: They calculate its birth—if [the new moon] was “born” before midday, it is known that it will be visible near sunset; if it was not born before…

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Rashi’s Hebrew commentary on the Babylonian Talmud was highly influential. It is known for the numerous brief explanatory phrases that enable the student to understand the flow of talmudic dialectic, as well as the occasional integration of the passage at hand with parallel or related discussions. This excerpt deals with a difficult passage in Rosh Hashanah that was relevant to the determination of the Jewish calendar.

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