9th Of Av 2024 Customs. תשעה באב or ט׳ באב, “the ninth of av,”) is an annual fast day in judaism, named for the ninth day (tisha) of the month of av in the hebrew calendar. Tu b’av occurs on a full moon, as the hebrew calendar is lunar.

The period begins on the 17th of the hebrew month of tammuz, a fast day that marks the day when the walls of jerusalem were breached by the romans in 69 ce. (4) bethar, the last stronghold of the leaders of the *bar kokhba war, was captured in 135 c.e.;