What is the book *De Revolutionibus Orbium Coelestium* about?

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It describes how Galileo's observations and Kepler's calculations proved the Copernican theory.

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It describes the construction of Galileo's telescope and his observations.

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It is a dialogue written to convince the general public of the merits of the Copernican theory.

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It lays out the Copernican theory for the first time.