Following the Second Temple of Jerusalem's destruction, Rosh Hashanah changed from a one-day event to a two-day event—due to the fact that it became too difficult to determine the date of the new moon.
Although this holiday is considered to have been established sometime during the 6th century BCE, the phrase "Rosh Hashanah" didn't surface until the Mishna — the book of Jewish oral laws
Originally referred to as "berches," the term "challah," coined in Austria, appears.
Tashlikh is the tradition of throwing items into a body of water to symbolize ridding oneself of sins.
