Why are the planetary rulers in Vimshottari Dasha sequenced the way they are? This is one of the many questions that I have pondered in my studies of Vedic Astrology. In my search for an answer one thing became abundantly clear, there is not much on the subject. There are only a handful of authors whose material I have had the fortune to obtain who have attempted to address this question. In other works where this question is raised, the overall consensus is that the reason behind the order of planetary rulers in Vimshottari Dasha is a mystery that has yet to be solved. With not being able to find a suitable answer in any of the already published material, I stumbled upon a subject called Vortex-Based Mathematics in the summer of 2009, where I was now able to see a possible explanation for why the order of planets in Vimshottari Dasha follows the sequence that it does. So I decided in December 2009 to attempt to put in writing the connection I saw with Vimshottari and what is called Vortex-Based Mathematics. I had completed a manuscript in September 2011, but did not think I had enough material to publish a book. After coming across the manuscript and the work I had already done in late January 2015, I decided that it would be well worth it to proceed with publishing the material I had put together. It is my sincere hope that this will help to shed some light on unraveling the mystery behind the order of planets in Vimshottari Dasha.

Prediction through Dasha System is the chief objective of Predictive Astrology. Maharshi Parashar has mentioned 43 types of Dashas in his "Brihat Parashar Hora Shastra". Here in this book the Vimshottari Dasha has been mentioned elaborately in particular, which is used extensively. Besides, the Ashtottari and Yogini Dashas have also been narrated briefly. Vimshottari Dasha system is based on constellation. This system is used throughout India and recognized by all. It is based on the lordship of planet. The native can have result according to the house of which the planet is the lord. So, it is essential to know the Karakatva of the house and the merit of the lord of it. The book has been composed keeping in view the problems of the students of All India Federation of Astrologers' Societies on the inspiration of Mr. Arun Kumar Bansal. This book explains the method of prediction on the basis of Dasha in any easy to understand manner. A learned astrologer has to make study of the three different parts of a horoscope - 1. Yoga, the combination of planets and Lords, 2. Period-sub-period i.e. dasha, 3. Gochar that is, transit. All the three parts are the supplements of each other. Yoga is most important among all the three parts. Period-sub-period i.e. dasha may prove to be futile if there is no Yoga in a horoscope. For example, Period-sub-period that of Lord of fifth house or of Karaka planet cannot bless a native with a child if there is no Santan Yoga in his horoscope. Likewise, Gochar too cannot do anything if there is no Yoga in a horoscope. So, all the three parts are essential to have the result.

2020 Edition of Science of Light: An Introduction to Vedic Astrology by Freedom Cole

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