Ptolemy's Tetrabiblos

Metadata

Gutenberg ID

70850

Title

Ptolemy's Tetrabiblos

Language

en

Book source

Project Gutenberg

Description max 80 words

This classic astrological treatise by Ptolemy systematically explores the influence of celestial bodies on human affairs. Newly translated from Greek, it offers a comprehensive guide to planetary qualities, fixed star influences, and the interpretation of horoscopes, blending ancient wisdom with rigorous astronomical observation.

Summary up to 500 words

Ptolemy's *Tetrabiblos*, a foundational four-book treatise on the influence of celestial bodies, establishes astrology as a rational science grounded in the physical qualities of the stars. The work begins by defining the masculine and feminine natures of planets based on their inherent moisture and heat, as well as their positions relative to the Sun and horizon. For instance, the Moon and Venus are feminine due to their moist qualities, while the Sun, Saturn, Jupiter, and Mars are masculine. Mercury is considered common to both genders, shifting between dryness and moisture. Furthermore, stars change their gender based on whether they are matutine (preceding the Sun) or vespertine (following it), and similarly, their position relative to the horizon determines if they are oriental (masculine) or occidental (feminine). The text details the specific influences of zodiac signs and fixed stars, assigning planetary temperaments to constellations both within and outside the zodiac. Ptolemy examines how planetary configurations affect the human body, linking specific signs to diseases. He distinguishes between minor ailments and incurable conditions caused by malefic planets like Saturn and Mars. For example, Saturn is associated with cold ailments such as rheumatism and jaundice, while Mars causes hot disorders like blood expectoration and sores. The work emphasizes that while malefics can cause harm, benefics like Jupiter and Venus can mitigate evil, and the ultimate outcome depends on the interplay of planetary positions, aspects, and elevation. A significant portion of the treatise is dedicated to the 'quality of the mind,' analyzing how planetary dominion shapes character traits. Saturn, when in a glorious position, renders a person austere, avaricious, and philosophical, but can make them penurious and treacherous if not elevated. Jupiter confers generosity, piety, and magnanimity. The text also covers the timing of events through complex calculations of annual, monthly, and daily periods, utilizing right ascension and directions. Throughout, Ptolemy presents a structured approach to predicting fate and understanding human nature, asserting that the heavens exert a profound influence on both physical health and moral character, provided that the benefic influences are not superseded by contrary conditions in elevation.

LLM editorial rating

4.2/5

Download URL

https://www.gutenberg.org/ebooks/70850.epub.noimages

Local file path

data/epubs/pg70850.epub

Download EPUB

Downloaded at

2026-07-08 18:28 UTC

Categories

• Classics
• Astrology