Rosh HaShanah 20a and Rosh HaShanah 20b, whether and how a court can adjust the months to be longer or shorter, the role of witnesses, and what kinds of untruths courts tolerate to adjust the calendar.
Rosh HaShanah 20a and Rosh HaShanah 20b, whether and how a court can adjust the months to be longer or shorter, the role of witnesses, and what kinds of untruths courts tolerate to adjust the calendar.