Three Copernican Treatises is a collection of three important works by the astronomer Nicolaus Copernicus, who revolutionized our understanding of the solar system. The first work, Commentariolus, is a short summary of Copernicus' heliocentric theory, which proposed that the sun, not the earth, was at the center of the universe. The second work, Letter Against Werner, is a response to the criticisms of the astronomer Andreas Werner, who argued against...