Ptolemy's Tetrabiblos, Or Quadripartite: Being Four Books of the Influence of the Stars

The Tetrabiblos, or Quadripartite of Ptolemy is one of the most signigicant surviving ancient texts about astrology. Its audthor, Claudius Ptolemy is most famous for being the originator of the Ptolemaic system whereby Earth stood fixed at the center of the universe, with crystalline spheres within spheres whirling around it. In balance, the universe had a vast influence on earthly events, which was the basis for the belief in Astrology.