An unknown astronomical work on planetary theory from the Renaissance: Giulio Cesare Luchini’s Delle revolutioni delle sfere celesti libri IX (ca. 1581)

This joint paper with Pietro D. Omodeo explores a little-known 1581 manuscript from Padua by Giulio Cesare Luchini, offering an early example of the vernacular reception of Copernicus in Italy. Luchini’s adaptation of Copernicus’s reciprocation mechanism—also known as the Ṭūsī couple, in acknowledgment of its inventor in Islamic astronomy—offers a fresh perspective on how Renaissance thinkers engaged with heliocentric models. It also contributes insightful material to ongoing debates about the origin and transmission of the reciprocation mechanism for modeling planetary motions.