Chapter

A more accurate inquiry from Ingolstadt

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/9780226707174.003.0009
A more accurate inquiry from Ingolstadt

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This chapter focuses on the publication of Christoph Scheiner's Accuratior Disquisitio and his second series of observation on the nature of sunspots. Scheiner clarified the mistakes he made in Tres Epistolae and argued that the sunspots could not be attached to the solar surface as Galileo claimed. This conclusion is supported by Scheiner's observation that sunspots are darker near the limb than at the center of the Sun and that they are rarely spherical and are always almost constantly changing shapes. Scheiner also hypothesized that sunspots are dark bodies similar to the dark matter he believed made up the Moon, Venus and Mercury and the satellites of Jupiter.

Keywords: Christoph Scheiner; Accuratior Disquisitio; Tres Epistolae; solar surface; dark bodies; dark matter

Chapter.  4832 words.  Illustrated.

Subjects: History of Science and Technology

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