Tisha B’Av is an annual fast day in Judaism, on which a number of disasters in Jewish history occurred, primarily the destruction of both Solomon’s Temple by the Neo-Babylonian Empire and the Second Temple by the Roman Empire in Jerusalem. Tisha B’Av marks the end of the three weeks between dire straits and 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 Gregorian 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. Source: Duckduckgo API