 In her recent study of Gersonides’ science, Glasner notes that Gersonides “stands out as one of the more creative and daring figures in the medieval west” (Glasner 2015, p. 13). What distinguished Gersonides from his predecessors was his reliance upon and consummate knowledge of mathematics, coupled with his belief in the accuracy of observations achieved by the use of good instruments. Because of this rootedness in empirical observation bolstered by mathematics, Gersonides believed that he had the tools to succeed where others had failed. Only when he has resolved the problems in astronomy does Gersonides apply their findings to theological cosmology. As we shall see, Gersonides’ theology and astronomy are deeply involved with each other.