On a cold night in the year 1514, Urania, the Greek goddess of astonomy, inspires Nicolaus Copernicus to re-imagine the cosmos with the sun at the centre -- a crime for which Zeus banishes her from Olympus. Then Julian Augustus, former emperor of Rome and an agent of Zeus, offers her a bargain: Find one mortal who can grasp the immensity of the universe without going mad, or else live in exile forever. With help from Promethus, the Titan, and...