The Feast of Trumpets, also known as Yom Teruah or Rosh Hashanah, occurs once a year on the first day of the seventh month (Tishri) in the Jewish lunisolar calendar. This means it is celebrated annually but the exact date varies each year in the Gregorian calendar, falling typically between September and October. It marks the beginning of the Jewish civil new year and is a holy day dedicated to the blowing of trumpets or shofars as a call to repentance and preparation for the Day of Atonement.