Kuhn underestimated what was "revolutionary" about Copernicus' work, and emphasized the difficulty Copernicus would have had in putting forward a new astronomical theory relying alone on simplicity in geometry, given that he had no experimental evidence. See also Copernican principle Notes References Further reading Analyses the varieties of argument used by Copernicus in De revolutionibus. External links Heliocentric Pantheon History of astronomy Nicolaus Copernicus Copernican Revolution