J.J. Schacter on the Jewish Meaning of Memory

We are now in a period in the liturgical calendar of the Jewish people known as the Three Weeks, which begins on the seventeenth day of the Hebrew month of Tammuz, and continues through the ninth day of the month of Av. It is a period of mourning and commemoration of many experiences of tragedy and sorrow in the Jewish past, and it culminates on the Ninth of Av, or Tisha b’Av, because on that day, in the year 586 BCE, Nebuchadnezzar’s forces destroyed the First Temple in Jerusalem. It was also on that day, in the year 70 CE, that Roman forces destroyed the Second Temple in Jerusalem. These events the Jewish people, together, as a nation, remember at this time of year.