Chapter

Galileo's third letter

in On Sunspots

Published by University of Chicago Press

Published in print October 2010 | ISBN: 9780226707150
Published online March 2013 | e-ISBN: 9780226707174 | DOI: http://dx.doi.org/10.7208/chicago/9780226707174.003.0012
Galileo's third letter

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This chapter discusses the contents of Galileo's third letter to Christoph Scheiner in response to his Accuratior Disquisitio. In this letter, Galileo provided detailed quantitative demonstration that Scheiner's arguments about the distance of the sunspots to the Sun could be correct. He also showed by numerical calculations that if the spots were distant from the Sun's surface there would be no foreshortening of the sunspots that were observed by Scheiner himself. Galileo was also displeased with Scheiner's claim to have discovered a fifth satellite of Jupiter and with the way Scheiner put these Medicean Stars to use.

Keywords: Galileo; Christoph Scheiner; Accuratior Disquisitio; Sun; foreshortening; Medicean Stars

Chapter.  24495 words.  Illustrated.

Subjects: History of Science and Technology

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