Klibansky, R., E. Panofsky & F. Saxl, 1979, Saturn and Melancholy,137-8.
The Greeks at first developed the planetary doctrine transmitted to them in classical times in a purely scientific direction. In this, an astrophysical viewpoint seems from the beginning to have been adopted simultaneously with the purely astronomical.
Epigenes of Byzantium, who is thought to have lived in early Alexandrian times and therefore to have been one of the oldest mediators between Babylon and Hellas, classified Saturn as "cold and windy". The epithet "cold", according both with the planet's great distance from the sun and with the god's great age adhered to Saturn throughout the years and was never questioned. The property of dryness, implied by "windy", on the other hand, came into conflict with the fact that Pythagorean and Orphic texts described the mythical Kronos as just the opposite, namely, as the god of rain or of the sea; and this accounts for the fact that in later, especially in astrological literature, we so often encounter the singular definition "natura frigida et sicca, sed accidentaliter humida", or something of the sort - a contradiction which can only be explained, if at all, with the help of laborious argumentation.
Whether it was really Posidonius who reduced the elemental qualities of the planets to an orderly system, we would not venture to decide, but it would be safe to say that it was, within the framework of the Stoic system that the doctrine was efldowed with its full meaning. Not till the formation of a cosmological system in which the opposites heat and cold determined the basic structure of the universe, did the qualities hitherto more or less arbitrarily tributed to the stars reveal a general and universally applicable law of nature, valid for both heavenly and earthly things and therefore establishing for the first time a rationally comprehensible connexion between the one set and the other. To Saturn, which was cold because of its distance from the sun (whether the Stoics thought it moist or dry we do not know), everything cold on earth was first related and finally subordinated ; and it is clear that this embodying of planetary qualities in a universal framework of natural laws must have brought the basic tenet of astrology, namely, the dependence of all earthly things and events upon the "influence" of the heavenly bodies, considerably nearer to Greek thought.
Klibansky, R., E. Panofsky & F. Saxl, 1979, Saturn and Melancholy. Nendeln/ Liechtenstein: Kraus Reprint.
