Ever since G‑d took us out of Egypt, the Jewish people have been keeping track of time—and celebrating the festivals—according to the lunar calendar, which contains 12 (or 13) months. Every month is either 29 or 30 days long, beginning (and ending) on a special day known as Rosh Chodesh (“The Head of the Month”). The months were once declared by a beit din (rabbinical court) after the new moon had been sighted, but now follow a predetermined calendar. Read More