February 1632

Galileo publishes the Dialogue on the Two Chief World Systems

Printed at Florence in February 1632, Galileo's Dialogue pits Simplicio's Aristotelian and Ptolemaic views against Salviati, who cites the novae of 1572 and 1604 and sunspots against unchanging heavens. In 1633 he is found "vehemently suspect of heresy" and the book banned.