Chapter

Galileo's first 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/9780226707174.003.0007
Galileo's first letter

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This chapter discusses the contents of Galileo's first letter to Marc Welser and Christoph Scheiner written in response to the latter's commentaries on his sunspot research. Galileo acknowledged his difficulty in making sustained observations of the sunspots but argued that they are real things and not simple appearances or illusions of the eye or the lenses. He shared his observation that the motion of the sunspots respect to the Sun appears to be similar to those of Venus and Mercury and also to those of the other planets around the same Sun.

Keywords: Galileo; Marc Welser; Christoph Scheiner; Sun; Venus; Mercury

Chapter.  8679 words.  Illustrated.

Subjects: History of Science and Technology

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