Tammuz (Tamuz) is the fourth of the 12 months of the Jewish calendar, counting from Nisan. The month of Tammuz begins the “season” of the summer. The three months of this season are Tammuz, Av and Elul.

The 17th day of Tammuz—a fast day that commemorates the day when the walls of Jerusalem were breached by the Romans (in 69 C.E.)—marks the beginning of a period known as “the Three Weeks.”

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