Building on ruins: Copernicus' defense of ancient astronomers against modern critics.

Nicholas Copernicus'De revolutionibus (1543) is a frequent starting point for histories of the Scientific Revolution on account of his dramatic reversal of the cosmic order handed down from antiquity. Nevertheless, Copernicus also mounted a surprisingly sharp attack on one of his contemporaries who tried to correct ancient astronomers. This uneasy balance between respecting and criticizing ancient works was part of broader contemporaneous attempts to grapple with the fragmentary legacies of past generations. Debates over stone ruins as well as manuscript texts shaped the evolution of early printed books, and artists, printers and instrument makers joined natural philosophers in pursuing novelties even while emulating tradition.