Marc E. Jones in his initial outing, How to Learn Astrology, writes in the preface,

 ASTROLOGY, as here presented, is the form of practice on which the majority of astrologers and their students agree, both in America and Europe. Its essence is the use of a horoscope made for the precise place, the exact minute and hour as well as the day, month and year of birth for the particular individual. It uses  the methods of calculation and interpretation that have their roots in Claudius Ptolemy (an Egyptian astrologer of Greek descent who wrote in the  2nd century A.D. and created the geocentric system that is the foundation of our art), Didacus Placidus de Titus (the father of the Placidian House System 1647-1657), William Lilly (1602-1681), and Lilly’s pupil, John Gadbury (d. 1691).   While there is no adequate history of astrology for the most part, its true record is the biographies and writings of its distinguished devotees.

The most serviceable historical sketch is an informative article on “Astrology” by Charles Singer of London in the Encyclopaedia of the Social Sciences, Volume II, Macmillan Publishing Company, New York, 1931.

We are very happy to provide the aforementioned entry for general interest.  Click on the image below to read the two pages in Flickr in a larger and more readable format.

Astrology pg. 1