Copernicus and the Aristotelian Theory of the Sun

Tycho's discovery and publication of his observations marked his transformation from a Danish de l'etante to an astronomer with a European reputation. To the Western world, the phenomenon that Tycho had been observing was proving to be a disquieting discovery. The notion of a star that could change as dramatically as Tycho had described shook confidence in the immutable laws of antiquity.