This enormous armillary sphere, more than 3 metres in height, was begun on 4 March 1588 and completed on 6 May 1593. It was constructed on the commission of Ferdinando I by his 'master of the Sphere', Antonio Santucci di Pomarance. At the centre of the sphere is the terrestrial globe, surrounded by seven planetary spheres and a sphere of the fixed stars bearing the zodiac band... a ninth, known as the Primum mobile, which is fixed and bears the polar caps and the meridians
A drum orrery by Harris & Co. circa 1820. The globe is labelled, Lane and Co. Benjamin Martin designed the drum type orrery. The mechanical works of this orrery are housed in a brass drum with a central fixed brass sun and articulated mechanical brass armatures mounted with ivory spheres representing nine orbiting bodies: Mercury, Venus, Earth, Ceres, Mars, Pallas Jupiter, Saturn and Uranus. The Earth, Jupiter, Saturn and Neptune are displayed with their separate orbiting moons..