Many consider this work by Crowley to be the foremost book on ceremonial magic written in the twentieth century. It was written especially for beginners as Part 3 of Book 4 (Liber ABA). The original was privately printed in 1929 after Crowley failed to find a publisher in London.

    Full facsimile of the original edition. Not reproduced with Optical Recognition Software. This book reveals how we may take advantage of certain periods to bring success, happiness, health and prosperity into our lives, and it likewise points out those periods that are not favorable for many of the things we try to achieve. It does not deal with astrology or any system of fortune telling, but presents a system long used by the Master Mystics in Oriental lands and which is strictly scientific and demonstrable. Provided is a guide on can consult weekly to navigate affairs throughout the years.