Yoga play a very important role in predictions through Janmapatrika. Unless the predictor takes into account resultant effects of various good and bad yogas in the Janmapatrika, his predictions just cannot be correct. Many a yoga neutralise one another or enhance or reduce good or evil effects of one another. Even while basing predictions on the basis of planetary position at the time of birth in Janmapatrika and the dynamic planets and vimshottary, the predictor must qualify them with the various yogas to be as near correct prediction as possible. This excellent book on yogas gives detailed information about them and its effect on the subject. a book worth reading by everyone who has interest in Astrology!