Synopsis The present book contains ten research papers presented at the Seminar by leading modern scholars on this subject from India and abroad and by authentic Sivacaryas. Synopses in Tamil have been given for research articles in English and vice-versa, for the benefit of readers from different parts of India and abroad. A brief note on Kavuttuvams and Navasandhi (Sandhyahvana-Sandhyavahana) is also added in this book.