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Robert Zoller is an astrologer specialized on predictive astrology with studies on Latin and history (Medieval and Renaissance periods). He wrote The Arabic Parts in Astrology - A Lost Key to Prediction in 1980 and revised it in 1989.
Part 1 - Background
In Chapter 1. How the parts were lost the author presents a brief history of the astrological charts. Interesting, the origin of the parts is not at the Arabs, but, far more ancient, from the time of the Babylonians. Still, it is true that the Arabs invented more and more parts and used them extensively. In Europe the Renaissance was the period when the parts lost their importance and, even faster than astrology, began to decay.
Chapter 2. The metaphysical basis of the parts is a real lesson of numerology blended with philosophical ideas. In the first part the author emphasize on the idea that the man is a Microcosm and present some quotas from Henry Cornelius Agripa, Giordano Bruno, Hermes Trismegistus and Pico della Mirandola to sustain his arguments. I think the main idea is true, but not very well explained and presented in a rather unclear manner. Robert Zoller should have been invested more energy and efforts to present such an important and beautiful idea. Then, begins the "numerology course" and are presented the first ten numbers with their meanings and the numerical basis for the planets exaltations.
Part 2 - The doctrine of the parts
Chapter 3. How to use the Parts means a few pages with several simple advices for calculating and analyzing the astrological parts.
Chapter 4. Bonatti's treatise on the parts is a translation made by Robert Zoller to a portion of Bonatti's book Liber Astronomiae. Has 50 pages and is divided in 9 sections. Are presented the astrological parts of the planets, the parts for houses and even some parts which will help you to judge the cheapness of some vegetables in a certain period. Hmm... If those last parts would work some astrologers would made a lot of money at the stock exchange! But is not the case!
Part 3 - Practical Illustrations
In Chapter 6 Natal Figures the author tries to prove by practical examples that the parts are working. He analyzes the part of religion and honesty of women on 4 charts, the part of fortune on 1 chart, the part of the Sun on 2 charts, the part of the Hyleg on 2 charts and the part of the eight house on 2 charts. Of course that by those examples, he shows the efficiency of the astrological parts. But, the question is: do those parts really work on every chart?
I made an exercise and tested the Part of Honesty of women (distance from Moon to Venus projected from the Ascendant) on 3 examples. Zoller quotes Bonatti:
"if this part is in a fixed sign or in the aspect of any of the lords of the dignities of the sign in which it is placed or any benefic, the women will be honest and religious even if she may be longing for coitus. But if the malefics aspect it without reception and it is in a mobile (cardinal) sign, the women will be excessive in her desire for coitus, giving herself to men... for a cheap price and she will be in every way a fornicatrix"