From Wikipedia about Rosh HaShanah:
Rosh HaShanah "start of the year" is the Jewish New Year. The biblical name for this holiday is Yom Teruah, literally "day of shouting or blasting." It is the first of the Jewish High Holy Days, as specified by Leviticus 23:23–25, that occur in the late summer/early autumn of the Northern Hemisphere. The High Holy Days comprise...