Abstract

Abstract<title> ABSTRACT </title>Explaining the Copernican doctrine in a concise passage of THE ASH Wednesday Supper (La cena de le Ceneri, London, 1584), Giordano Bruno ascribed four motions to the earth, although Copernicus limited their number to three. This discrepancy may seem a mere misunderstanding, but a detailed and contextual reading of the passage reveals that Bruno, although accepting the Copernican 'idea' of explaining the motions of the sun and of the fixed stars through the displacement of our planet, Bruno probably drew these motions from Peuerbach's Theoricae novae planetarum rather than from Copernicus' De revolutionibus orbium coelestium. Thus, he 'transferred' to the earth the annual revolution and the three motions traditionally ascribed to the fixed stars (daily rotation, precession of the equinoxes and 'trepidation') to the earth: which makes four motions altogether.

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