Unpacking Rosh Hashanah: Its Biblical Roots and Evolving Traditions

While modern Jews celebrate Rosh Hashanah on the first day of the Hebrew month of Tishrei, the Torah itself presents a different calendar. In the biblical narrative, Nisan is designated as the first month, marking the Exodus from Egypt, as stated in the Book of Exodus. The Torah refers to the day in Tishrei not as Rosh Hashanah, but as "a day of remembrance of blowing (shofar)" or "a day of blowing (shofar)" in Leviticus and Numbers, respectively. These passages instruct Israelites to observe a day of rest, offer sacrifices, and blow the shofar, but do not identify it as the start of the year.

The concept of multiple "New Years" is introduced in the Mishnah, which outlines four distinct New Years: Nisan 1 for kings and festivals, Elul 1 for animal tithes, Tishrei 1 for the Sabbatical and Jubilee years, and Tu B'Shvat for trees. This indicates that Nisan retained its status as the first month, while Tishrei 1 acquired the role of the beginning of the year count. The names of the months, such as Nisan and Tishrei, were adopted by the Jewish people through contact with Babylon, with "Tishrei" likely deriving from the Akkadian word for "beginning."

The significance of Tishrei 1 grew in later biblical texts, such as Nehemiah, which describes a gathering on the first day of the seventh month. However, the full meaning of Rosh Hashanah as a day of judgment and the anniversary of creation solidified in Rabbinic literature (Chazal). This evolution was influenced by internal debates within Judaism regarding calendar calculation, particularly during the Second Temple period, where solar and lunar calendars coexisted. The shift in authority from priestly control to rabbinic courts after the destruction of the Temple in 70 CE was pivotal in establishing Tishrei 1 as the primary New Year.

The familiar Rosh Hashanah customs, like eating apples and honey, are later additions. The shofar, mandated in the Torah as "a day of blowing," gained additional symbolic meanings over time. The "simanim" (symbolic foods) tradition, mentioned in the Talmud, involves eating foods whose names lend themselves to blessings and wordplay, such as pumpkin (for tearing up harsh decrees) and dates (for enemies to be finished). Apples and honey, however, are a more recent custom, particularly associated with Ashkenazi communities. The Tashlikh ceremony, where people cast breadcrumbs into water, also developed centuries after the Talmudic era.

Therefore, the Rosh Hashanah celebrated today is a composite of traditions developed over generations. The Torah provided the "day of blowing," the Sages established Tishrei 1 as the New Year for years and the concept of the Day of Judgment, and later customs enriched the holiday with symbolic foods and rituals. While Nisan remains the first month, Tishrei 1 became the New Year for counting years, with both traditions coexisting.