Uniting these Aristotelian principles with a prevalent Greek philosophy employed by Zeno of Citium and the Pythagoreans, the next three chapters arrange the planets into pairs of opposites.
•
The early 20th-century Humanist astrologer Dane Rudhyar reported that the astrology of his era "originated almost entirely in the work of the Alexandrian astrologer, Claudius Ptolemy".
•
The translator of the Loeb 1940 English translation, F. E. Robbins, reports a "puzzling problem" regarding the final paragraph of the book.
The Egyptian Arabic astrologer and astronomer Ali ibn Ridwan, writing in a commentary on Ptolemy's Tetrabiblos, stated that the "...spectacle was a large circular body, 2½ to 3 times as large as Venus. The sky was shining because of its light. The intensity of its light was a little more than a quarter that of Moon light" (or perhaps "than the light of the Moon when one-quarter illuminated").