How many books are in Ptolemy's astrological treatise, Tetrábiblos?
Four
Three
Five
Six
Answer
The word "Tetrábiblos" means "Four Books" in Koine Greek. Ptolemy's astrological treatise consists of four books, which aimed to adapt horoscopic astrology to the Aristotelian natural philosophy of his time.
Discovering the Epitome of Knowledge: A Ptolemy Quiz