Permeating the ‘Boundaries’ of the Cimento. Giovanni Domenico Cassini and the Florentine Academy

Historians have devoted considerable attention to the Florentine Accademia del Cimento’s involvement in astronomical disputes, particularly those concerning the existence of Saturn’s rings and the leading telescope makers of the time. In contrast, less attention has been devoted to the Academy’s engagement with the observation of Jupiter’s satellites. This article brings to light new archival evidence, focusing on the role played by Giovanni Domenico Cassini’s relationship with the Florentine scientific community—an aspect acknowledged in scholarship but never examined in detail. Cassini’s 1665 visit to Florence, during which he sought independent verification of his Jovian ephemerides, reignited local interest in these observations. This paper has a twofold aim: first, to demonstrate that, much like in other well-known cases, the Cimento functioned as a testing ground for astronomical investigations; and second, to highlight the Academy’s openness to external influences, revealing its collaborative ethos and permeable intellectual ‘boundaries.’