Study Sanhedrin folio 13A with parallel Hebrew-English text, traditional commentary, and modern study tools. Free access to Babylonian Talmud online.
R' Yosei says: The year must be intercalated only if 21 days of Tishrei will pass before the autumnal equinox. The Talmud explains: And both of them expounded the same verse to arrive at their respective opinions: “And the Festival of the Ingathering at the turn of the year” (Exodus 34:22). They bo
The Talmud asks: What do they each hold? If they hold that the day of the equinox concludes the season, meaning that it is counted as part of the preceding season, then even if the season of Tammuz is not lacking more than this number of days until its completion, the year would need to be intercala
The Talmud raises an objection to this conclusion from a different baraita: The day of the equinox concludes the season; this is the statement of R' Yehuda. R' Yosei says: The day of the equinox begins the season. It is therefore clear that they disagree about this issue, and that the previous barai
And furthermore, it is taught in a baraita (Tosefta 2:7): The court intercalates the year only if the season of Tammuz was lacking its completion for most of the month of Tishrei. And how much is: Most of the month? 16 days. R' Yehuda says: Two parts, meaning 2/3rds, of the month. And how much is:
The baraita continues: R' Yosei says: The court calculates the seasons, and if the winter season of Tevet, which is before Passover, is lacking its completion for 16 days into the month of Nisan, the court intercalates the year, so that Passover will occur within the season of Nisan, i.e., the spr