20. The planets are stars which are not fixed in the heavens like the rest, but move along in the air.... Sometimes they move towards the south, sometimes towards the north, generally in a direction opposite to that of the universe, sometimes with it, and their Greek names are Phaeton, Phaenon, Pyrois, Hesperus, Stilbon.
21. To these the Romans have given the names of their gods, that is, of Jupiter, Saturn, Mars, Venus, Mercury. Deceiving themselves and wishing to deceive [others] into worship of these gods, who had bestowed upon them somewhat in accordance with the desire of the world, they pointed to the stars in heaven, saying that that was Jove’s star, that Mercury’s, and the empty idea arose. This erroneous belief the devil cherished, but Christ destroyed.
22. Moreover as to the constellations which are given names by the heathen, in which the likeness of living creatures is traced by means of the stars, like Arctos, Aries, Taurus, Libra, and others, they who first discerned constellations in a number of stars were influenced by superstitious vanity and imagined a bodily form, giving them, because of certain reasons, the likenesses and names of their gods.
23. For they named Aries, the first constellation—to which, as to Libra, they assign the middle line of the universe[275]—after Jupiter Ammon, on whose head image makers fix the horns of a ram (arietis cornua).
24. This the heathen set as the first among the constellations because in the month of March, which is the beginning of the year, they say the sun is moving in that constellation.
26. Cancer, too, they so named because when the sun comes to that constellation in the month of June, it begins to move backward in the manner of a crab (in modum cancri), and brings in the shorter days; for in this creature front and rear are indistinguishable and it advances either way, so that its fore part may be behind and its back part before.
32. Moreover Aquarius and Pisces they named from the rainy season, because heavier rains fall in winter when the sun turns at these constellations. And it is a wonderful folly of the heathen that they have raised to the heavens not only fish, but rams also, and he-goats and bulls, she-bears and dogs, crabs and scorpions. They have also placed among the stars of heaven an eagle and a swan, in memory of Jove, because of the myths about him.
33. They believed, too, that Perseus and his wife Andromeda were received into the heavens after their death, so they marked out likenesses of them in the stars, and did not blush to call them by their names.
37. But by whatever fashion of superstition these are named by men, they are nevertheless stars, which God made at the beginning of the universe and ordained to mark the seasons with regular motion.
38. Therefore observations of these constellations, or nativities, or the rest of the superstition that attaches itself to the observance of the stars—that is, to a knowledge of the fates—and is doubtless opposed to our faith, ought to be ignored by Christians in such a way that it would seem they had not been written.