Armillary sphere. Turned pillar supported by tripod feet on triangular base with magnetic compass inset. Four arms supporting an horizon ring. Engraved with names of winds, months of year and zodiac signs. The symbol of the moon fitted with an extra rotating ring to show the motion of the lunar axis, this ring divided 1-28. A named, cranked Earth is in the centre.
The primary sphere consists of eight brass rings. Inside the primary sphere, there two movable systems of brass rings connected to two short axes fixed at the North and South eclipitic poles of the primary sphere. These systems represent the orbs of the Sun and Moon. The larger system (for the Sun) consists of three brass rings fixed perpendicularly to each other. One of these rings is in the plane of the ecliptic and carries a disc for the Sun. The smaller system (for the Moon) also consists of three brass rings, similarly constructed. Inside this ring there is a fourth ring which carries a device for the Moon and its phases comprising a mobile graduated ring with an excentric disc and a mobile lunar face. Inside the systems of the Sun and Moon, there is a smaller brass terrestrial globe labelled 'TERRAE GLOBUS', mounted on an equatorial polar axis, connected to two little arcs which are in turn attached to the two ecliptical axes, so that the poles of the Earth always point to the equatorial poles of the primary sphere. The terrestrial globe shows only the polar circles, the tropics, the equator, and four meridians, and no outlines of the lands and seas. In many respects, this armillary sphere resembles the one made by Antonio Costa AST0620. It may, therefore, have been made in Italy, in the circle of Costa. For further information about the cartography and construction of this armillary sphere please refer to the related publication, Globes at Greenwich.