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After the publication of Sidereus Nuncius, in the controversy with Ch. Scheiner, Galileo developed several arguments on behalf of the hypothesis that sunspots are contiguous to the surface of the Sun, and presented them in his Istoria e dimostrazioni intorno alle macchie solari e loro accidenti (Rome 1613). One of them, named by Galileo a Practical Method, advocates very clearly the correctness of...
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