Gerd Graßhoff, "Ptolemy and Empirical Data", in: Sonja Neef, Henri Sussmann and Dietrich Boschung (Eds.), Astroculture. Figurations of Cosmology in Media and Arts, München: Wilhelm Fink Verlag, 2014, 32–44                    
                                                    Published In
                        Sonja Neef, Henri Sussmann and Dietrich Boschung (Eds.), Astroculture. Figurations of Cosmology in Media and Arts, München: Wilhelm Fink Verlag, 2014                    
                                