CHT218667 Giovanni Domenico Cassini (1625-1712), illustration from \'Histoire des Mathematiciens by Alexandre Saverien (1720-1805), published in Paris 1766 (engraving) by French School, (18th century); Private Collection; (add.info.: discovered four of Saturn\'s moons; Tethys and Dione (both in 1684); and the major division in its rings, now named after him; first director of the Paris Observatory (1669);); 穢 Archives Charmet; French, out of copyright.