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Ptolemy's Tetrabiblos

Chapter 11: CHAPTER VIII THE INFLUENCE OF POSITION WITH REGARD TO THE SUN
By Ptolemy
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About This Book

A systematic astrological treatise that explains how the sun, moon, planets and fixed stars are understood to affect weather, geography and human affairs. It lays out technical vocabulary and procedures—signs, houses, aspects, triplicities, exaltations and terms—then applies them across four parts: foundational principles and methods; climatic and regional forecasts including eclipses and atmospheric phenomena; rules for casting nativities and interpreting birth, temperament, health and longevity; and worked examples with tables and commentary. The work emphasizes a disciplined, observational approach to linking astronomical positions with types and timings of terrestrial events.

CHAPTER VIII
THE INFLUENCE OF POSITION
WITH REGARD TO THE SUN

The respective powers of the Moon and of the three superior planets are either augmented or diminished by their several positions with regard to the Sun.

The Moon, during her increase, from her first emerging to her first quarter, produces chiefly moisture; on continuing her increase from her first quarter to her full state of illumination, she causes heat; from her full state to her third quarter she causes dryness; and from her third quarter to her occultation she causes cold.

The planets, when matutine, and from their first emerging until they arrive at their first station, are chiefly productive of moisture; from their first station until they rise at night, of heat; from their rising at night until their second station, of dryness; and from their second station until their occultation, they produce cold.[32]

But it is also sufficiently plain that they must likewise cause, by their intermixture with each other, many varieties of quality in the Ambient: because, although their individual and peculiar influence may for the most part prevail, it will still be more or less varied by the power of the other heavenly bodies configurated with them.