Chapter

Galileo's second 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/9780226707174.003.0008
Galileo's second letter

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This chapter discusses the contents of Galileo's second letter to Marc Welser and Christoph Scheiner about his observation of the sunspots. Galileo reaffirmed his belief that the dark spots seen on the solar disk are either contiguous to the Sun or are separated from it by a distance so small as to remain entirely invisible. He provided sketches of his observation and explained the theoretical bases of his claims. Galileo also argued that the sunspots are carried around by the revolution of Sun.

Keywords: Galileo; Marc Welser; Christoph Scheiner; Sun; sketches; theoretical bases

Chapter.  11744 words.  Illustrated.

Subjects: History of Science and Technology

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