Audiobook Ptolemy's Tetrabiblos : 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 presents a comprehensive foundation for astrological prognostication, arguing that celestial bodies exert measurable influences on the physical world. He addresses the skepticism surrounding the science, distinguishing between the immutable laws of astronomy and the variable nature of sublunary objects acted upon by the ambient environment. The text details the specific properties of the planets, the Sun, and the Moon, categorizing them by their elemental qualities of heat, moisture, dryness, and cold. Ptolemy explains the mechanics of how planetary configurations, tropical signs, and stellar aspects alter the atmosphere and shape human temperament, physical characteristics, and destinies. He emphasizes that astrological predictions should not be viewed as unalterable fatalism, but rather as natural tendencies that can be understood and mitigated through observation and medical science. The work methodically covers the influences of zodiacal signs, triplicities, and planetary houses, laying the groundwork for both universal mundane astrology and individual genethliacal analysis.