The Sun in the Church by J.L. Heilbron is a provocative work of scholarship that challenges long-held views of the relationship between science and Christianity. Heilbron's main point is simple enough: "The Roman Catholic Church gave more financial and social support to the study of astronomy for over six centuries, from the recovery of ancient learning during the late Middle Ages into the Enlightenment, than any other, and, probably, all other, institutions." Despite the persecution of Galileo, Heilbron notes, the Church actively supported mathematical and astronomical research--often designing cathedrals that could also function as observatories--in order to set the precise date of Easter (a crucial endeavor for maintaining the unity of the Church). Heilbron's fluid, engaging style brings his detailed reconstructions of 16th- and 17th-century Church politics to life. And his argument that scientific knowledge was deemed both morally neutral and politically useful during the Reformation and beyond yields an unusually interesting, complex, and human understanding of Catholicism in the early Modern period. --Michael Joseph Gross