American Federation of Astrologers founders Catharine and Ernest Grant created this four-volume series of books to help students learn astrology and to share their practical techniques with advanced students and professionals. These books cover the fundamental principles of astrology using clear and concise language while guiding the reader through the steps necessary to horoscope construction and interpretation. Volume I, Elementary Astrology, explains the fundamentals of the science of astrology, calculation procedures for natal horoscopes, meanings of the houses, zodiacal signs, planets, and aspects. Volume II, Analysis of the Horoscope, covers physical descriptions and characteristics for the faces (five-degree divisions of the zodiac), detailed definitions of the nature of the planets along with their influences in houses and the significance of aspects. Volume III, Synthesis of the Horoscope, thoroughly covers delineation in a unique manner and discusses houses and planetary aspects as they affect basic complexes in human behavior. A method of comparing two or more horoscopes is included. Volume IV, Predictive Astrology, deals with methods of progressions, diurnals, solar and lunar returns, radix and solar arc direction, solar revolutions, transits and other important techniques.