The two-day festival of Rosh Hashanah is observed on the 1st and 2nd days of Tishrei. In Hebrew, Rosh Hashanah means, literally, "Head of the Year," and as its name indicates, it is the beginning of the Jewish year. The anniversary of the creation of Adam and Eve, it is the birthday of mankind, highlighting the special relationship between G – d and humanity.
The primary theme of the day is our acceptance of G – d as our King. The Kabbalists teach that the renewal of G – d’s desire for the world, and thus the continued existence of the universe, is dependent upon this. We accept G – d as our King, and G – d is aroused, once again, with the desire to continue creating the world for one more year.
The central observance of Rosh Hashanah is the sounding of the shofar , the ram’s horn. The shofar is sounded on both days of Rosh Hashanah. The sounding of the shofar represents, among other things, the trumpet blast of a people’s coronation of their king. The cry of the shofar is also a call to repentance; for Rosh Hashanah is also the anniversary of man’s first sin and his rep entance thereof, and serves as the first of the "Ten Days of Repentance" which will culminate in Yom Kippur, the Day of Atonement. Altogether, we listen to 100 shofar blasts over the course of the Rosh HaShanah service.