1632 c. February 22
Galileo Galilei publishes "Dialogue Concerning the Two Chief World Systems," defending the Copernican theory of heliocentrism, the idea that the Earth orbits the Sun, leading to his trial for heresy by the Roman Inquisition in 1633. The book was published in Florence, Italy, with the first copy being received by his patron on February 22, 1632.
