Astronomy is the basis of Astrology, and as the ÅšÄstras state, SiddhÄnta is the mathematical component of Jyotiá¹£a. One must study the SiddhÄnta to understand how the ancient Mahará¹£is and Ä€cÄryas computed the Graha positions. Learning the evolution and history of a subject is as much important as the current state of the subject.
The knowledge of computation of planetary positions in the sky is only a starting point in the entire field of astronomy. After covering the method of determining the Longitude and Latitude of a Graha, SÅ«ryasiddhÄnta moves on to apply that in ascertaining astronomical events such as Yuti (conjunction), AstÄá¹…gata (combustion), Grahayuddha (planetary fights), Vakragati (retrogression), Grahaṇa (eclipse) and several others. This book explores the astronomical and astrological aspects of such events.
Also covered are an introduction to Aá¹…kaÅ›Ästra, or Vedic Numerology, which is based on the Year, Month, Day and HorÄ lord. SiddhÄnta texts lay down the principles of determining them but are hardly used today. I hope this book will serve as a guide to the mathematical-minded Jyotiṣīs to Astronomical aspects of Jyotiá¹£a.
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