Includes "Commentariolus," Copernicus' hypotheses for heavenly motions; "Narratio Prima," popular introduction to Copernican theory; and "The Letter Against Wer

Includes "Commentariolus," Copernicus' hypotheses for heavenly motions; "Narratio Prima," popular introduction to Copernican theory; and "The Letter Against Wer

"The "Commentariolus" is Copernicus's most lucid exposition of his system. The "Letter against Werner" throws light on development of Copernicus's thought. The

Galileo’s Dialogue Concerning the Two Chief World Systems, published in Florence in 1632, was the most proximate cause of his being brought to trial before th