Christopher M. Graney is professor of physics and astronomy at Jefferson Community & Technical College in Louisville, Kentucky (USA), where he helps keep the college’s observatory running. For some years now his research focus has been the history of astronomy, especially the late 16th and early 17th centuries. He is the author of the 2015 book Setting Aside All Authority: Giovanni Battista Riccioli and the Science Against Copernicus in the Age of Galileo, and the forthcoming book Mathematical Disquisitions: The Booklet of Theses Immortalized by Galileo, both published by the University of Notre Dame Press.