Apollonius of Perga writes the Conics in 8 books (7 survive: 4 in Greek, 3 in Arabic; the eighth lost), systematizing and extending the prior knowledge of Menaechmus and Euclid on conic sections. He coins the terms 'ellipse,' 'parabola,' and 'hyperbola' still in use today. He demonstrates that the three curves are obtained by sectioning a single double cone with planes of different inclinations. Kepler directly applies Apollonius's conics to formulate his laws of planetary motion (1609): orbits are ellipses because Apollonius defined the ellipse. The recovery of the Arabic text in the Renaissance (Borelli, 1661) and its European rediscovery formed the geometric basis of the scientific revolution.