Dialogo sopra i due Massimi Sistemi del Mondo
aka Systema cosmicum
Dialogue Concerning the Two Chief World Systems

Dialogue Concerning the Two Chief World Systems is a 1632 book by Galileo Galilei comparing Nicolaus Copernicus's heliocentric system model with Ptolemy's geocentric model. Written in Italian, it was translated into Latin as Systema cosmicum in 1635 by Matthias Bernegger. The book was dedicated to Galileo's patron, Ferdinando II de' Medici, Grand Duke of Tuscany, who received the first printed copy on February 22, 1632. It consists of four Socratic dialogues between the Copernican Salviati, the educated layman Sagredo and the geocentrist Simplicio. They discuss the findings of their "mutual friend the Academician" (Galileo).— Wikipedia
Dialogo di Galileo Galilei Linceo matematico sopraordinario dello studio di Pisa. E Filosofo, e Matermatico primario del serenissimo Gran Duca di Toscana. Dove ne i congreſſi di quattro giornate ſi discorre ſopra i due massimi sistemi del mondo Tolemaico, e Copernicano; proponendo indtereminatamente le ragioni Filosofiche, e Naturali tanto per l'una, quanto per l'altra parte.
[Dialogue of Galileo Galilei, Member of the Accademia dei Lincei, Extraordinary Mathematician of the University of Pisa. And Chief Philosopher and Mathematician to the Most Serene Grand Duke of Tuscany. Where over the course of four days discussions are held concerning the two Major World Systems: the Ptolemaic and the Copernican; showing without bias the Philosophical and Natural reasons in favor of each.]
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