Planetary Strength - a commentary on Morinus is an intermediate level textbook on natal horoscope interpretation. Taking as its point of departure Astrologia Gallica by Jean Baptiste Morin de Villefranche (1583 - 1656), Planetary Strength explains the differences between the strengths conferred upon planets by virtue of their sign placements (celestial state), house placements (terrestrial state) and aspects (aspectual state). A detailed system of keywords is augmented by insightful \"cookbook\" interpretations for each and every planetary combination. The depth and quality of the analysis - as well as the hundreds of practical examples and tips - make Planetary Strength an essential reference work which both neophyte and experienced practitioners will consult every time they read a horoscope.