Manly Hall's Astrology and Reincarnation offers a concise and piercingly insightful dive into each individual zodiac sign from the perspective of karma, as it pertains to past lives and reincarnation. It also notes the connections among various methods of the science of astrology when evaluating both past and future incarnations, both Western (tropical) and Eastern (Vedic or Sidereal, and Tibetan).
To make his claims plain and elevate his treatise from theory to science, he provides a thorough comparison of the lives of two great emperors: Alexander the Great, and Flavius Claudius Julian (with the latter even claiming to be Alexander's reincarnated self). Never before (or ever since) has the telling relationship between astrology, karma, and reincarnation been made more clear and unmistakable - while simultaneously justifying the presence of astrology as a precise science for elucidating knowledge of one's self, when properly utilized.