Title: Mathematical disquisitions
Description: Johann Georg Locher wrote Disquisitiones Mathematicae (Mathematical Disquisitions) in 1614, about astronomy and the sun. Galileo replied, through Dialogue Concerning the Two Chief World Systems, Ptolemaic and Copernican, in 1632.
Subjects: Early works to 1800, Astronomy, Sunspots, Astronomy, early works to 1800
Places: Sun
People: Galileo Galilei (1564-1642), Johann Georg Locher