The book "De Revolutionibus Orbium Coelestium"
a. describes how Galileo's observations and Kepler's calculations proved the Copernican theory.
b. describes the construction of Galileo's telescope and his observations.
c. is a dialog written to convince the general public of the merits of the Copernican theory.
d. first described the Copernican theory.
e. describes the Tychonian theory.
D
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