Horary Astrology is the art of perceiving the relation between thought as it is generated in the mind and the appearance caused by motion of the heavens and the heavenly bodies. The author claims there is a true science of divination and that Horary Astrology is one road leading to that true science. The enlightened soul can foresee the future according to the degree of her enlightenment. This volume is a guidebook for achieving this enlightenment.