Ptolemy's Tetrabiblos : $b or Quadripartite, being four books of the influence of the stars ... with a preface, explanatory notes, and an appendix containing extracts from the Almagest of Ptolemy and the whole of his Centiloquy, together with a short notice of Mr. Ranger's zodiacal planisphere and an explanatory plate
"Ptolemy's Tetrabiblos: or Quadripartite, being four books of the influence of" by Claudius Ptolemy is a text on astrology written in the 2nd century CE. This companion volume to Ptolemy's astronomical masterwork Almagest shaped astrological practice for over a millennium. Ptolemy systematically arranged astrological techniques and defended the subject through natural philosophy, explaining celestial influences using Aristotelian principles. The work profoundly influenced medieval Islamic and Christian thought, earned theological acceptance, and became required reading at Renaissance universities, leaving an enduring mark on Western culture and modern astrological practice.