This early work on spherical trigonometry is both expensive and hard to find in its first edition. It contains a comprehensive account of the subject and includes numerous examples and exercises. This is a fascinating work and highly recommended for anyone interested in learning spherical trigonometry. Many of the earliest books, particularly those dating back to the 1900s and before, are now extremely scarce. We are republishing these classic works in affordable, high quality, modern editions, using the original text and artwork.

Thousands of years ago, people first observed a correlation between the heavenly bodies and events on Earth. Out of these early observations and subsequent refinements came what today is known as astrology. For most of these millennia, astrologers used only the seven visible planets: Sun, Moon, Mercury, Venus, Mars, Jupiter and Saturn. It is out of this tradition that Helena Avelar and Luis Ribeiro have written this extensive book on astrology. The rules and principles here presented apply to all branches of astrologyA natal, mundane, horary and elective. Their method is the traditional and time-honored one, and includes, among others, chapters on: The Planets The Zodiac and the Signs The Essential Dignities The Houses The Aspects Chart Dynamics The Condition of the Planets The Fixed Stars The Parts The Power of the Planets Using this traditional method, it is possible not only to thoroughly and completely read the natal chart but to do so with a breadth and depth of meaning not found in the modern methods of astrological interpretation. It avoids cookbook-type methods and centers on the practical understanding of the astrological concepts, presenting the Tradition in present-day language. In addition, more than two hundred fifty illustrations make the traditional principles easy to understand and use in chart interpretation. This practical how-to book is one of a kind, and the one that will teach you the traditional methods and you reach into the past to benefit from the knowledge of the authors and astrologers from ancient Babylonia through the medieval period. It is suitable for both beginners and advanced students, as it provides the indispensable core of astrological knowledge, at the same time allowing more experienced students to organize their knowledge into a coherent system.

Reprint of the original, first published in 1841.