From sunset of September 8 through to sunset September 10 is Rosh Hashanah, ראש השנה, literally “Head of the year,” In contemporary Judaism it is “New Year” in the year 5771. This feast is celebrated on the first two days of of Tishrei, the seventh month of the Hebrew calendar. It is also called Yom Teruah.
In Jewish liturgy Rosh Hashanah is “the day of judgment” and “the day of remembrance”. It is a day of rest (Leviticus 23:24). When not on Shabbat, there is the blowing of the shofar (in ancient times it was also sounded on the Sabbath in the Temple), the shofar is normally made from a ram’s horn.