🌙 Laws of Sanctification of the New Month

Foundations of the Hebrew Calendar — Lunar Months, Solar Years, and Court Authority

Witness Testimony for the New Moon and Court Sanctification

Witness Travel, Shabbat Override, Messengers, and Two-Day Yom Tov

Intercalation of the Year — Signs, Process, and Limitations

Authority for Setting the Calendar, the Fixed Calculation, and Two-Day Yom Tov

Calculating the Molad, the 19-Year Cycle, and Calendar Arithmetic

Setting Rosh Chodesh Tishrei — The Four Postponement Rules

The Order of Full and Deficient Months — Year Types and Calculation

Calculating the Seasons (Tekufot) — Solar Year, Equinoxes, and Verification