On what day were the Temples destroyed?

FOR THE NINTH OF AV, JUST PAST: Tisha B’Av: On What Day Were the Jerusalem Temples Destroyed? (Dr. Rabbi Zev Farber, TheTorah.com).

The First Temple was destroyed either on the 10th of Av (Jeremiah 52:12) or the 7th (2 Kings 25:8). The Second Temple, according to Josephus, was destroyed on the 10th. How did Rabbinic Jews come to commemorate the destruction of both Temples on the 9th of Av?

This year's Tisha B'Av post is here.

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