What do the words Rosh Hashanah mean?
Rosh Hashanah is Hebrew for head or beginning of the year. In the Torah, we read, In the seventh month, on the first day of the month, there shall be a sacred assembly, a cessation from work, a day of commemoration proclaimed by the sound of the Shofar. Therefore, we celebrate Rosh Hashanah on the first day of Tishrei, the seventh month of the Jewish calendar. The number assigned to the Jewish year changes on Rosh Hashanah based on ancient rabbinic reckoning of when the world was created.