Tres Epistolae

in On Sunspots

Published by University of Chicago Press

Published in print October 2010 | ISBN: 9780226707150
Published online March 2013 | e-ISBN: 9780226707174 | DOI:
Tres Epistolae

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This chapter discusses the contents of Tres Epistolae, Christoph Scheiner's three letters to Galileo about sunspots which he wrote under the name Apelles. It the first letter, Scheiner shared his observation about the blackish spots on the Sun and in the second letter he suggested that the spots may be caused by Venus which at same point conceal a portion of the Sun from the Earth's view. In the final letter he argued that it is impossible that the spots are on the Sun since they spend no more than fifteen days on the Sun. He also proposed that the sunspots are either fixed or wandering stars.

Keywords: Tres Epistolae; Christoph Scheiner; Galileo; Venus; Sun; wandering stars; fixed stars

Chapter.  6458 words.  Illustrated.

Subjects: History of Science and Technology

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