This book explores the changing perspective of astrology from the Middle Ages to the Early Modern Era. It introduces a framework for understanding both its former centrality and its later removal from legitimate knowledge and practice. The discussion reconstructs the changing roles of astrology in Western science, theology, and culture from 1250 to 1500. The author considers both the how and the why. He analyzes and integrates a broad range of sources. This analysis shows that the history of astrology—in particular, (...) the story of the protracted criticism and ultimate removal of astrology from the realm of legitimate knowledge and practice—is crucial for fully understanding the transition from premodern Aristotelian-Ptolemaic natural philosophy to modern Newtonian science. This removal, the author argues, was neither obvious nor unproblematic. Astrology was not some sort of magical nebulous hodge-podge of beliefs. Rather, astrology emerged in the 13th century as a richly mathematical system that served to integrate astronomy and natural philosophy, precisely the aim of the “New Science” of the 17th century. As such, it becomes a fundamentally important historical question to determine why this promising astrological synthesis was rejected in favor of a rather different mathematical natural philosophy—and one with a very different causal structure than Aristotle's. (shrink)

In the early twenty-first century, we often ask whether there is life (intelligent or otherwise) in the cosmos, but almost never whether the heavens themselves are actually alive or animated, that is, infused somehow with a soul, the anima mundi, or some such entity. This was not the case in the Middle Ages, the Renaissance, or the early modern period. Although Aristotelians normally answered no to this question, Marsilio Ficino (1433–99) took a decidedly Platonic turn when he answered the question (...) positively, insistently, and consistently in a broad range of works over his entire philosophical career. By contrast, Giovanni Pico della Mirandola (1463–94), Ficino’s younger contemporary, began by embracing the new Platonic position but joined the Aristotelian fold in his later works. In this essay, I will briefly compare and contrast Ficino’s solid and consistent position with the changing trajectory of Pico’s views over the course of his short but intense career. This essay is an exploration of central themes and some preliminary reflections thereon. These essentially Platonic views of a living universe provide the conceptual and literary foundations for understanding this issue in the early modern period. (shrink)

Although in his later years Giovanni Pico della Mirandola vehemently rejected astrology, he earlier used it in a variety of ways, but primarily to provide further evidence for positions to which he had arrived by other means. One such early use appears in his commentary on his friend Girolamo Benivieni’s love poetry, the Canzone d’amore, of 1486–1487. In the passages discussed here, Pico presents an intensive Platonic natural philosophical analysis based on a deep astrologically informed understanding of human nature as (...) he attempts to explain a perennial question, namely, why one person is attracted to a certain person , and another to others. I will place this discussion of the mysteries of attraction and desire in historical perspective by tracing Pico’s changing relationship to astrology during the course of his short but passionate life, and in historiographic perspective by revising Frances Yates’s still influential views concerning Pico’s contribution to Renaissance thought and his relationship with Marsilio Ficino. (shrink)