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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