Post Lot Text
First edition of Cassini's tables of the movements of the four satellites of Jupiter. They had been discovered by Galileo, who had been unable to compile these tables. With powerful telescopes obtained from Roman lensmakers, Cassini managed to complete the tables, upon which he improved after his move to France (see lot 3). In 1675 Olaus Röhmer used Cassini's tables to demonstrate that light has finite speed. The dedication copy to Cardinal Giacomo Rospigliosi, nephew of Pope Clement IX, probably bound in the Roman atelier of the Andreoli brothers.