The ninth day of the month of Av (August 1 this year) is the saddest holiday of the Jewish year, marking the destruction of the First and Second Temples. No one eats or drinks on this day, nor do they wear leather shoes. The fast begins on the evening of the 8th of Av just before sunset and ends with the appearance of the first star on the evening of the 9th. The 9th of Av is also the one day during the year on which a Jew is not only not obliged to study Torah, but is forbidden from doing so (learning being considered a source of joy).