A new Physics to support the Copernican system. Gleanings from Galileo's works

Galileo’s support to the Copernican theory was decisive for the revolutionary astronomical discoveries he achieved in 1610. We trace the origins of Galileo’s conversion to the Copernican theory, discussing in particular the “Dialogo de Cecco di Ronchitti da Bruzene in perpuosito de La Stella Nuova”. Later developments of Galileo’s works are briefly treated.