Who determines the Jewish calendar? Thirty-five Mishnayos across four Perakim — the moon, the witnesses who saw it, the Beis Din that declared the month, and the shofar of the day that month made possible.
Open the mesechta expecting the shofar and the tefillos and you may be surprised: more than half of it is about something else entirely — the moon, the witnesses who saw it, and the Beis Din that declares the beginning of a new month. They belong together because Rosh Hashana is the only Yom Tov that begins on Rosh Chodesh itself. Before the day of Rosh Hashana could begin, the month of Tishrei had to.
Three themes run through it. Rosh Chodesh — how the lunar month was established, who had the authority to establish it, and what happened when that process came under pressure. A beginning to the year — the lines that separate what belongs to one year from what belongs to the next. And the first of Tishrei — the Yom HaDin and the Yom Teruah. Perakim 1 and 2, together with the first Mishnah of Perek 3, are Kiddush HaChodesh; the rest of Perek 3 and all of Perek 4 turn to the shofar, the tefillos, and the practices that changed after the Churban.
Carry one question through every perek: who determines the Jewish calendar? The Beis Din does not control the moon — it follows its own cycle whether anyone sees it or not. And yet the month did not begin until two witnesses came, the Beis Din examined them, and the Nasi declared the new moon mekudash. Every date of the year followed from that word.
Counted from the colour-coded text of each Mishnah.
The mesechta enters Kiddush HaChodesh in an unusual place — not with the moon but with the messengers sent out to announce it, and with the question of when a witness may travel on Shabbos to testify. That order is itself the teaching: Kiddush HaChodesh was never one isolated courtroom act. It depended on ordinary people willing to look and to travel, on testimony that could be trusted, on a careful and authoritative Sanhedrin, and on a reliable way of carrying the result to the rest of the nation.
Every step here can be heard on Zeman Nakat Radio — the mesechta introduction, a primer on Kiddush HaChodesh, an introduction before each perek, one before the laws of shofar, and the summary of the mesechta at the end. The whole run is listed below.
Each card carries the audio, the Hebrew with colour coding, a clause-by-clause translation, the shape of the Mishnah where it has one, a summary chart and the meforshim. Start anywhere.
Every shiur, in order, wherever you listen. The full learning experience — synchronized text, translation, structure, charts and meforshim — lives here on the site.
THE LIVED MISHNAH