Rosh HaShanah 8a and Rosh HaShanah 8b, the debate about whether the Rosh HaShanah for animals is first of Elul or of Tishrei, first of Tishrei as the time when the world is judged, the relationship between different kinds of Rosh HaShanah, including how we know the beginning of shemittah is the first of Tishrei.
