...In the seventh month, on the first of the month, there shall be a sabbath for you, a remembrance with shofar blasts, a holy convocation. -Leviticus 16:24
My wish to you and yours -
"L'shanah tovah tikateiv v'taichateim"
"May you be inscribed and sealed for a good year."
May your year be a sweet one filled with Health, Happiness and Prosperity.
Background about Rosh Hashanah here.
Elisheva at Ragamuffin Studies also has a great post about this holiday.
"The central observance of Rosh Hashanah is the sounding of the shofar, the ram's horn, which represents 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 repentance thereof, and serves as the first of the "Ten Days of Repentance" which culminate in Yom Kippur, the Day of Atonement. Another significance of the shofar is to recall the Binding of Isaac which also occurred on Rosh Hashanah, in which a ram took Isaac's place as an offering to G-d; we evoke Abraham's readiness to sacrifice his son and plead that the merit of his deed should stand by us as we pray for a year of life, health and prosperity. Altogether, the shofar is sounded 100 times in the course of the Rosh Hashanah service."