In this Support Team Study, Calculating Passover in the Middle Ages, Nehemia speaks with a scholar at University College London about how Karaite Jews implemented the biblical calendar in exile, how they determined the beginning of the year when faced with bedouin bandits, and the vagaries of the vernal equinox. As a bonus they discussed when Karaites stopped observing the Aviv biblical calendar and the significance of Yom Kippur in 1844.