Galilei, Galileo - Richard S. Westfall (essay date 1989)

Richard S. Westfall (essay date 1989)

SOURCE: "Bellarmino, Galileo, and the Clash of Two World Views," in Essays on the Trial of Galileo, Vatican Observatory Publications, 1989, pp. 1-30.

[In the following essay, Westfall summarizes the backgrounds of Galileo and his adversary, Cardinal Bellarmino (also known as Bellarmine), and argues that their conflict regarding Galileo's officially heretical belief in a Copernican or heliocentric universe began as early as 1610 with the publication of Sidereus nuncius (The Starry Messenger).]

And because it has also come to the attention of the aforementioned Sacred Congregation [the final paragraph of a decree of 5 March 1616 by the Congregation of the Index stated] that the Pythagorean doctrine concerning the mobility of the earth and the immobility of the sun, which Nicholas Copernicus, De revolutionibus orbium coelestium, and Diego de Zùñiga [in his commentary] on Job also...

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