Planetary Strengths is the first book on Shad Bala and Bhava Bala which deals with detailed calculations based on Vedic Classical Principles and Application of Balas for delineation of Horoscopes. The book covers Sthana Bala, Dig Bala, Kaala Bala, Cheshta Bala, Naisargik Bala and Drik Bala. An attempt has also been made to add Vimshopaka Bala and Rashmi Bala as well as Ishta Bala and Kashta Bala. The Aspects of the Planets have been explained with graphs in a lucid and novel way. A number of example Horoscopes have been analysed from the point of view of profession, health, marital life and prosperity based on these Balas. It provides a base for further research on this aspect of Astrology.