The quadrant, fitted with sights, is set for latitude 43° (corresponding to the belt including Tuscany, Umbria, and the northern part of Lazio). The front carries a shadow square, hour lines and a "Tabula Solis motus" (Table of the motion of the Sun) indicating the Sun's entrance into the zodiac signs. The back carries a large tilting iron foot, used as a support. Signed by Girolamo della Volpaia. Provenance: Medici collections.