We have made a comparison between the structures of the main books of Ptolemy and Copemicus, to test the contention of Neugebauer about the lack of originality in Copemicus. This work was not really necessary to validate our thesis about the problem (Lavagnino, 1972), but the difficulty to get De Revolutionibus counsel us to publish the material. Because of financial troubles we wait other opportunity for the printing in extenso.