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Greek astrology is often, and more properly, referred to as Hellenistic astrology. It actually originated in Egypt at some point after the conquest by Alexander the Great and the beginning of the Christian era. Hellenistic astrology also comprises Byzantine and Roman astrology. It’s therefore more a reference to the general geographic area and an era in history, rather than to one particular society or culture.
While Hellenistic astrology
can’t be linked to any one individual or culture, it is the root of all modern, or Western astrology. There are numerous documents written in Greek, although some are written in Latin, that are devoted to natal astrology. This is the branch of astrology that concerns the individual. Part of the reason that it’s difficult to source these documents to any one individual or culture is that they span a period of time of about 800 years.
But that doesn’t mean that important Greek philosophers and scientists haven’t been part of the development of astrology. Hippocrates used astrological interpretations as part of his medical diagnostic system. Pythagoras studied in Egypt, and while nothing in writing exists of Pythagoras’ theories, he is attributed with stating that the Earth, Planets and fixed stars revolved around the sun, thousands of years before Galileo! Later though, his theory was refuted by Aristotle who declared that the Earth was the centre of the world. Following Alexander’s conquest of Mesopotamia, Greek astrology 
began to take on a more personal approach. The Zodiac and planets being made to correspond to figures from their mythology; the Stoic philosophers are especially receptive to astrology. Greek astrology 
influences the metaphysical astrology of India. In approximately 70 BCE, the Greeks devised the first personal horoscope based on time of birth and in 30 BCE, the Emperor Augustus had his horoscope charted and interpreted by Thrasyllus.
There was a time when astrology was an accepted science and was a part of medical diagnoses, as much as were a patient’s physical symptoms. It’s hard to say whether we’ve e-volved or de-volved, as we no longer think about living in harmony with cosmos. We consider ourselves too advanced scientifically to think that movements in the stars and planets might have a serious impact on our daily lives and our health.
But are we right. Who is anyone to say that man, with his limited brain, can truly comprehend the workings of the universe, or how he fits within it. Western civilization is predicated on conquering, not understanding. But it wasn’t always so.
Astrology is one of the most important historical contexts in which astronomy developed. The Babylonians carefully assembled tablets of the position of Venus, as it was believed to denote omens for weather, war, famine, diseases, rulers and kingdoms. Claudius Ptolemy composed the Tetrabiblos, believing that astrology could be placed on a rational footing, despite being a conjectural art like medicine. In practice, belief in astrology meant that horoscopes were cast for new-born children, prospective spouses and political enemies, public buildings were opened and marriage and other ceremonies conducted on auspicious days. Numerous records of astrological practice can be found from the Roman times and physicians routinely consulted astrological charts as part of the diagnostic process.
For instance, every sign of the zodiac was considered to rule a part of the human body: the Sagittarius ruled the thighs, Pisces the feet, and so on. When the moon was in the zodiac ruling a particular part of the body, bloodletting from that part was to be avoided, since the attraction of the moon might cause excessive bleeding. Numerous medical manuscripts and almanacs include the figure of the 'zodiac man' as a reminder of the specific influence of the moon. In addition, the power of the moon's pulling power varied by its phases, and thus almanacs usually showed the phases of the moon.
