Ptolemy's Tetrabiblos, Or Quadripartite -

Ptolemy systematically organized the astrological knowledge of his time into four distinct sections:

: The final book examines external life events, such as wealth, social status, marriage , and travel. Scientific and Philosophical Approach Ptolemy's Tetrabiblos, Or Quadripartite

Unlike his predecessors, Ptolemy attempted to ground astrology in the of his time. He used Aristotle’s concept of the four elements and the four humors to explain how the "emanations" of the planets physically affected the Earth's atmosphere and, by extension, human bodies. : Ptolemy defends astrology as a legitimate, though

: Ptolemy defends astrology as a legitimate, though less certain, science compared to astronomy. He introduces the "powers" of the planets based on physical qualities—such as heat, moisture, dryness, and cold—and describes the nature of the zodiac signs. though less certain

: Here, Ptolemy moves to the individual, discussing factors present at birth that determine physical appearance, temperament, and parental influence.