Ptolemy's Tetrabiblos

Ptolemy · 1822

About the book

The book every astrologer since has been arguing with. Ptolemy wrote it in second-century Alexandria as the companion to his Almagest — the stars' effects after the stars' motions — and defended the art the way a physician defends a prognosis: fallible, but not therefore false. Read here in Ashmand's 1822 translation, with the Centiloquy attached.

Inside the course

14 parts

The case for the art: what may be known by astronomy, and how far
That prescience is useful — Ptolemy's answer to his own sceptics
The influence of the planetary orbs; benefic and malefic, diurnal and nocturnal
The fixed stars, and the constellations north and south of the zodiac
The four angles, the seasons, and the quality of the signs
Signs commanding and obeying, beholding and inconjunct: the configurations
Houses, triplicities, exaltations and terms — the planets' dignities
Application, separation, and the other faculties of the planets
Book II: the astrology of nations, climates and regions
Eclipses — the time, the place, the class affected, the quality of the effect
Comets, the new moon of the year, and the signification of meteors
Book III: conception, birth, the degree ascending, parents, brothers, twins
The duration of life, the prorogatory places, and the exemplification
Book IV: wealth, rank, employment, marriage, children, travel and the kind of death

Questions

Is Ptolemy's Tetrabiblos free to read in Astra Trainer?

Yes. The full book opens free in the app’s reader, in English, Spanish, German, French, Italian, Polish, Portuguese, and Russian.

What is the short course?

14 short parts that walk through the book’s key ideas in slides, each with a quick quiz.

Where do I get the app?

Astra Trainer is free on the App Store and Google Play. Ptolemy's Tetrabiblos is waiting in the app’s library.