Diodorus Siculus tells us that the Egyptian priests pretty generally predicted the years of barrenness or abundance, the contagions, the earthquakes, inundations, and comets. The knowledge of celestial phenomena made an essential part of the theology of the Egyptians as it did of the Chaldæans. They had colleges of priests specially attached to the study of the stars, at which Pythagoras, Plato, and Eudoxus were instructed.
Religion was besides completely filled with the symbols relating to the sun or moon. Each month, each decade, each day was consecrated to a particular god. These gods, to the number of thirty, were called in the Alexandrine astronomy decans (δέκανοι). The festivals were marked by the periodical return of certain astronomical phenomena, and those heliacal risings to which any mythological ideas were attached, were noted with great care. We find even now proof of this old sacerdotal science in the zodiac sculptured on the ceilings of certain temples, and in the hieroglyphic inscriptions relating to celestial phenomena.
According to the Egyptians, who were no less aware than the Greeks, of the influence of atmospheric changes on our organs, the different stars had a special action on each part of the body. In the funeral rituals which were placed at the bottom of the coffins, constant allusion is made to this theory. Each limb of the dead body was placed under the protection of a particular god. The divinities divided between them, so to speak, the spoils of the dead. The head belonged to Ra, or the Sun, the nose and lips to Anubis, and so on. To establish the horoscope of anyone, this theory of specific influences was combined with the state of the heavens at the time of his birth. It seems even to have been the doctrine of the Egyptians, that a particular star indicated the coming of each man into the world, and this opinion was held also by the Medes, and is alluded to in the Gospels. In Egypt, as in Persia and Chaldæa, the science of nature was a sacred doctrine, of which magic and astrology constituted the two branches, and in which the phenomena of the universe were attached very firmly to the divinities or genii with which they believed it filled. It was the same in the primitive religions of Greece.
The Thessalian women had an especially great reputation in the art of enchantments. All the poets rival one another in declaring how they are able, by their magical hymns, to bring down the moon. Menander, in his comedy entitled The Thessalian, represents the mysterious ceremonies by the aid of which these sorcerers force the moon to leave the heavens, a prodigy which so completely became the type of enchantments that Nonnus tells us it is done by the Brahmins. There was, in addition, another cultus in Greece, namely, that of Hecate with mysterious rays, the patron of sorcerers. Lucian of Samosate—if the work on astrology which is ascribed to him be really his—justifies his belief in the influence of the stars in the following terms:—"The stars follow their orbit in the heaven; but independently of their motion, they act upon what passes here below. If you admit that a horse in a gallop, that birds in flying, and men in walking, make the stones jump or drive the little floating particles of dust by the wind of their course, why should you deny that the stars have any effect? The smallest fire sends us its emanations, and although it is not for us that the stars burn, and they care very little about warming us, why should we not receive any emanations from them? Astrology, it is true, cannot make that good which is evil. It can effect no change in the course of events; but it renders a service to those who cultivate it by announcing to them good things to come; it procures joy by anticipation at the same time that it fortifies them against the evil. Misfortune, in fact, does not take them by surprise, the foreknowledge of it renders it easier and lighter. That is my way of looking at astrology."
Very different is the opinion of the satirist Juvenal, who says that women are the chief cultivators of it. "All that an astrologer predicts to them," he says, "they think to come from the temple of Jupiter. Avoid meeting with a lady who is always casting up her ephemerides, who is so good an astrologer that she has ceased to consult, and is already beginning to be consulted; such a one on the inspection of the stars will refuse to accompany her husband to the army or to his native land. If she only wishes to drive a mile, the hour of departure is taken from her book of astrology. If her eye itches and wants rubbing, she will do nothing till she has run through her conjuring book. If she is ill in bed, she will take her food only at the times fixed in her Petosiris. Women of second-rate condition," he adds, "go round the circus before consulting their destiny, after which they show their hands and face to the diviner."
When Octavius came into the world a senator versed in astrology, Nigidius Figulus, predicted the glorious destiny of the future emperor. Livia, the wife of Tiberius, asked another astrologer, Scribius, what would be the destiny of her infant; his reply was, they say, like the other's.
The house of Poppea, the wife of Nero, was always full of astrologers. It was one of the soothsayers attached to her house, Ptolemy, who predicted to Otho his elevation to the empire, at the time of the expedition into Spain, where he accompanied him.
The history of astrology under the Roman empire supplies some very curious stories, of which we may select an illustrative few.
Octavius, in company with Agrippa, consulted one day the astrologer Theagenes. The future husband of Julia, more credulous or more curious than the nephew of Cæsar, was the first to take the horoscope. Theagenes foretold astonishing prosperity for him. Octavius, jealous of so happy a destiny, and fearing that the reply would be less favourable to him, instead of following the example of his companion, refused at first to state the day of his birth. But, curiosity getting the better of him, he decided to reply. No sooner had he told the day of his birth than the astrologer threw himself at his feet, and worshipped him as the future master of the empire. Octavius was transported with joy, and from that moment was a firm believer in astrology. To commemorate the happy influence of the zodiacal sign under which he was born, he had the picture of it struck on some of the medals that were issued in his reign.
The masters of the empire believed in astrological divination, but wished to keep the advantages to themselves. They wanted to know the future without allowing their subjects to do the same. Nero would not permit anyone to study philosophy, saying it was a vain and frivolous thing, from which one might take a pretext to divine future events. He feared lest some one should push his curiosity so far as to wish to find out when and how the emperor should die—a sort of indiscreet question, replies to which lead to conspiracies and attempts. This was what the heads of the state were most afraid of.