At seemingly random points across the composition (but not at all random in reality) the page is studded with tiny squares of gold leaf. These are the stars in the constellation depicted. The text, which runs to several pages, explains that the stars rotate ceaselessly between the celestial poles, and that these are guarded by the bears of Crete, who had protected Jupiter as a baby from his cannibalistic father, Saturn, in return for which they had been set in the sky to mark the poles. They are known as Helice of the seven stars and Cynosura, who has never deceived Phoenician sailors guided by her. Between them…runs a giant snake, like a river, with stars along its body…These are the constellations which we still know as Ursa Major and Ursa Minor, with the Plough.