Ninth of Av

Tisha B'Av
Destruction of the Temple of Jerusalem, by Francesco Hayez
Official name	Hebrew: תשעה באב‎ English: Ninth of Av
Observed by	Jews
Type	Jewish religious and national
Significance	Mourning the destruction of the ancient Temples and Jerusalem, and other major calamities which have befallen the Jewish people.
Observances	Fasting, mourning, prayer
Date	9th day of Av (if Shabbat, then the 10th of Av)
2016 date	Sunset, August 13 – nightfall, August 14
2017 date	Sunset, July 31 – nightfall, August 1
Frequency	annual
Related to	The fasts of Gedalia, the Tenth of Tevet and the Seventeenth of Tammuz, the Three Weeks & the Nine Days

 Tisha B'Av  (lit. "the ninth of Av") (Hebrew: תשעה באב‎ or ט׳ באב‎) is an annual fast day in Judaism which commemorates the anniversary of a number of disasters in Jewish history, primarily the destruction of both the First Temple by the Babylonians and the Second Temple by the Romans in Jerusalem.

Tisha B'Av is regarded as the saddest day in the Jewish calendar and it is thus believed to be a day which is destined for tragedy.Tisha B'Av falls in July or August in the Western calendar.

The observance of the day includes five prohibitions, most notable of which is a 25-hour fast. The Book of Lamentations, which mourns the destruction of Jerusalem is read in the synagogue, followed by the recitation of kinnot, liturgical dirges that lament the loss of the Temples and Jerusalem. As the day has become associated with remembrance of other major calamities which have befallen the Jewish people, some kinnot also recall events such as the murder of the Ten Martyrs by the Romans, massacres in numerous medieval Jewish communities during the Crusades and The Holocaust.