Astronomy.- Piazzi (Giuseppe) Della Specola Astronomica de' Regi Studi di Palermo..., first edition, 4 folding engraved plates, lightly spotted, original limp boards, uncut, neat paper reinforcements to spine ends, else a very excellent example, folio, Palermo, Reale Stamperia, 1792.

⁂ Piazzi's account of the astronomical instruments he had commissioned and assembled for Palermo Observatory, which he established. This is where he made the observations that led to his discovery, on January 1, 1801, of the minor planet Ceres. Specola Astronomica includes Piazzi's description of the astronomical instruments he had commissioned and assembled for the Palermo Observatory, the most famous of which was Jesse Ramsden's vertical circle, illustrated on the plates in the first volume. Piazzi published two additional parts of this work, but without plates, in 1794 and 1806 (the last part being exceptionally rare).