Final answer:
The trumpets are blown in Judaism during the holiday of Rosh Hashanah, also known as the Jewish New Year.
Step-by-step explanation:
Trumpets are blown in Judaism during the holiday of Rosh Hashanah. Rosh Hashanah, also known as the Jewish New Year, is a time of reflection and repentance. It is customary to blow the shofar, which is a trumpet made from a ram's horn, during Rosh Hashanah synagogue services as a call to repentance and a reminder of the holiday's significance.