Referred to as the "Jewish New Year". It is observed on the first day of Tishrei, the seventh month of the Hebrew calendar. Rosh Hashanah is the first of the High Holidays or Yamim Noraim or Asseret Yemei Teshuva which are days specifically set aside to focus on repentance that conclude with the holiday of Yom Kippur. Rosh Hashanah is the start of the civil year in the Hebrew calendar. It is the new year for people, animals, and legal contracts. The Mishnah also sets this day aside as the new year for calculating calendar years and shmita and yovel years. Acording the Torah and Mishnah Rosh Hashanah is known as the "day of judgment." Rosh Hashanah is characterized by the blowing of the shofar, a trumpet made from a ram's horn, intended to awaken the listener from his or her "slumber" and alert them to the coming judgment.
Rosh Hashana is the first judgment day after this day comes Asseret Yemei Teshuva and after Yom Kippur and this day is the second judgment day in this day everybody are fasting and do thier self examination.