In this book, the renowned psychiatrist and consciousness researcher Stanislav Grof presents his groundbreaking insights for the first time in a comprehensive overview. Grof's decades-long research and clinical work have focused on the systematic investigation of the therapeutic, transformative, and evolutionary potential of extraordinary states of consciousness, which can be induced either consciously or spontaneously through psychedelic substances, holotropic breathwork, or psychospiritual crises. To better guide the direction of these fundamental therapeutic processes, Grof has been utilizing transit astrology for several years, collaborating with the well-known astrologer and cultural philosopher Dr. Richard Tarnas. In this book, Grof shares their experiences on this topic for the first time, using practical examples.