Post Lot Text
First editions of Cassini's manual of astronomy and of his collection of astronomical tables. As head of the Paris observatory, Cassini produced many valuable observations and a few original hypotheses of limited scope. He was a timid Copernican, a convinced Cartesian, a fervent disciple of his father, Gian Domenico Cassini (see lot 2), but not a Newtonian. The two works are uniformly and very finely bound in gold-tooled armorial red morocco (with citron morocco lettering-pieces) for Henri François d'Aguesseau (1668-1751), honorary member of the French Academy of Sciences, distinguished jurist and parliamentarian, chancellor of France (1717) and Royal treasurer (1736), who formed a large and fine library; the entire collection was left to his second son and eventually sold at auction in 1766.