mjb141 said:Furthermore, in his diaologues Galileo explicity states that his intention is to bring down Aristotelianism. "Salviati: 'Is it possible for you to doubt that if Aristotle should see the new discoveries in the sky he would change his opinions and correct his books and embrace the most sensible doctrines, casting away from himself those people so weak-minded as to be induced to to go on abjectly maintaining everything he had ever said?'" To cast aside a doctrine which had held so much sway for over 1500 years is no small intellectual feat. (Note I speak only of Aristotelian physics and astronomy).
But Aristotelian physics had not held sway for over 1500 years. On the contrary, it had held sway for only about 300 years when Galileo was around. Aristotelian logic had been extremely important for the whole of the Middle Ages, but Aristotle's physics, ethics and metaphysics had only been rediscovered in the West in the twelfth and thirteenth centuries, and it was not until after the work of Albertus Magnus and Thomas Aquinas that he was generally accepted as an authority. Before that time, most churchmen had despised him (Tertullian had looked forward to watching Aristotle burn in hell, whilst even Gregory of Nyssa called him an evil genius!).
Besides which, Galileo was hardly the first to want to overturn Aristotle. Paracelsus was quite clear that his intention was to overturn not just Aristotle but every other medieval authority, especially Galen. There's nothing remarkable about rejecting the views of an established authority - students do it in every generation - what is remarkable is successfully showing them to be wrong. Galileo did do that to a considerable extent, overturning Aristotle's physics with his famous experiments, but he didn't succeed in wrecking Aristotelianism to the degree that he hoped to. That really would be left to Newton (Descartes didn't manage it either).