About the month of Av: Important facts and figures Tish'ah be-Av (Ninth of Av): A day of mourning for the destruction of the Temple A dirge for Tish'ah be-Av: The signs of the zodiac bewail the fate of Jerusalem Anonymous By the rivers of Babylon ( * audio recording * ) Music by Salomone Rossi (17th cent.) / performed by the Zamir Chorale of Boston Collective memory and archetypal thinking: How Jewish group memory was preserved through the ages David G. Roskies Tu be-Av (Fifteenth of Av): A day for love and rejoicing The Jewish calendar: How it is calculated and when it was established The Jewish calendar: Solar/lunar structure The zodiac in Jewish tradition