The Dialogue Concerning the Two Chief World Systems (Dialogo sopra i due massimi sistemi del mondo) is a 1632 Italian-language book by Galileo Galilei comparing the Copernican system with the traditional Ptolemaic system.
Dialog Terkait Dua Sistem Utama Dunia (Dialogo sopra i due massimi sistemi del mondo) adalah sebuah buku berbahasa Italia 1632 karya Galileo Galilei yang membandingkan sistem Copernican dengan sistem Ptolemaik tradisional.