Rosh Hashanah (ראש השנה) begins at sundown on September 13. The name "Rosh Hashanah" is not used in the Bible to discuss this holiday. The Bible refers to the holiday as Yom Ha-Zikkaron (the day of remembrance) or Yom Teruah (the day of the sounding of the shofar). The shofar is a ram's horn which is blown somewhat like a trumpet. One of the most important observances of this holiday is hearing the sounding of the shofar in the synagogue. The shofar is not blown if the holiday falls on a Sabbath.