Dividing The Heavens: A Manual For Horoscope Wheel Calculations

Inspired and commissioned by the late astrologer Al H Morrison, Dividing The Heavens is a handbook for the "compleat" astrologer. Here is a treatment of the complex trigonometry of erecting a precise horoscope wheel from raw data, rather than relying on the compromise results inherent in the use of chart tables. Featured are methods for the derivation of five house systems: Porphyry, Alcabitius, Campanus, Regiomontanus and Koch. The first four of these are classics which can be used at any latitude with very few points of failure. Calculation of those horoscopes for births beyond the Arctic and Antarctic Circles is included as well as the correct computation of geocentric latitude. Dividing the Heavens includes a complete glossary of terms, many diagrams, explanations of formulae derivation, and several examples for each set of calucations. Calculation of a rectified birth time from an established Ascendant is also provided.