Definition of Astrology, from the Encyclopaedia Britannica

This article is an excerpt from pages 795-796 of the 11th edition of the Encyclopaedia Britannica...published in 1910
I use this edition because as a student of Archaeology and Art History-- it is the one recommended during my university. After this edition, history, geography, art and biography were deleted for additions in technology and science.
It is a famous distinction, as any bookseller of any real merit knows.

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ASTROLOGY,
The ancient art or science of divining the fate and future of human beings from indications given by the positions of the stars (sun, moon and planets). the belief in a connexion between the heavenly bodies and the life of man has played an important part in human history. For long ages astronomy and astrology were identified; and a distinction is made between "natural astrology," which predicts the motions of the heavenly bodies, eclipses, etc., and "judicial astrology," which studies the influence of the stars on human destiny. Isadore of Seville (died 636) is one of the first to distinguish between astronomy and astrology; nor did astronomy begin to rid itself of astrology till the 16th century, when, with the system of Copernicus, the conviction that the earth itself is one of the heavenly bodies was finally established.The study of astromancy and the belief in it, as part of astronomy, is found in a developed form among the ancient Babylonians, and directly or indirectly through the Babylonians spread to other nations. It came to Greece about the middle of the 4th century, B.C. and reached Rome before the opening of the Christian era. In India and China astronomy and astrology are largely reflections of the Greek theories and speculations; and similarly with the introduction of Greek culture into Egypt, both astronomy and astrology were actively cultivated in the region of the Nile during the Hellenistic and Roman periods. Astrology was further developed by the Arabs from the 7th to the 13th century and the Europe of the 14th and 15th centuries astrologers were dominating influences at court.
2pages later:
The endeavor to trace the horoscope of the individual from the position of the planets and stars at the time of birth represents the most significant contribution of the greeks to Astrology. the system was carried to such a degree of perfection that later ages made but few additions of an essential character to the genethliology or drawing up of horoscopes by the Greek astrologers. the system was taken up almost bodily by the Arab astronomers, it was embodied in the Kabbalistic lore of Jews and Christians, and through these and other channels came to be the substance of the astrology of the middle ages, forming as already pointed out, under the designation of "judicial astrology" a science which was placed on a perfect footing of equality with" natural astrology". Partly in further development of views unfolded in Babylonia, but chiefly under Greek influences the scope of astrology was enlarged until it was brought into connexion with practically all of the know sciences, botany, chemistry, zoology, mineralogy anatomy and medicine.


this is a 12 page article, about 1/2 the size of the article on astronomy in the same volume, which has hundreds of descriptions of persons who contributed to various discoveries in the past 300 years.