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		| Paper: | 
		Galileo Reader and Annotator | 
	 
	
		| Volume: | 
		441, The Inspiration of Astronomical Phenomena VI | 
	 
	
		| Page: | 
		43 | 
	 
	
		| Authors: | 
		Besomi, O. | 
	 
	
	
		| Abstract: | 
		In his readings, Galileo made frequent use of annotations. Here, I
 will offer a general glance at them by discussing the case of the
 annotations to the Libra astronomica published in 1619 by
 Orazio Grassi, a Jesuit mathematician of the Collegio Romano. The
 annotations directly reflect Galileo's reaction to Grassi's book in a
 heated debate between the two astronomers. Galileo and Grassi had
 opposite ideas about the nature of the comets, which resulted in
 different scientific and theological implications. The annotations
 represent the starting point for Galileo's reply to the Libra,
 namely Il Saggiatore, which was published four years later and
 dedicated to the new pope Urban VIII. | 
	 
	
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