i Where Heaven and Earth Meet (1888). Image: New York Public Library/Science Photo Library. Umbrella Research Theme (2017-2023) Astronomy of the Early Modern Era Computational History of Science Gerd Grasshoff This research area studies turning points in the history of modern astronomy in Copernicus and Kepler. Chemical & Physical Sciences Mathematics Practical Knowledge Projects 2017-2023 Gerd Grasshoff Kepler/Copernicus more