On September 16, 1978, there was an eclipse of the moon in Riyadh. Late one afternoon it became visible: a dark shadow moving slowly across the face of the pale moon in the darkening blue sky. There was a frantic knocking on the door. When I opened it, our neighbor asked if we were safe. He said it was the Day of Judgement, when the Quran says the sun will rise from the west and the seas will flood, when all the dead will rise and Allah's angels will weigh our sins and virtue, expediting the good to Paradise and the bad to Hell. Though it was barely twilight, the muezzin suddenly called for prayer--not one mosque calling carefully after another, as they usually did, but all the mosques clamoring all at once, all over the city. There was shouting across the neighborhood. When I looked outside I saw people praying in the street.