The brass sphere at the center of the armillary represents the Earth. This reproduction of a European Demonstrational Armillary Sphere shows the relationship among important lines and points in the sky such as The Celestial Equator, the Celestial Poles, the Ecliptic and the Vernal Equinox. The ecliptic rings are divided with the signs of the zodiac and this Armillary Sphere has an extra divided axis where the entire celestial sphere can be set to any angle. The rim of the armillary sphere is marked "A PARIS Chez G. Gobille a P Ache Royalle." This armillary sphere is solid brass with a rich antique patina finish that will not tarnish or show fingerprints. The heavy solid brass base is mounted on turned solid hardwood, and the bottom is covered with felt. The Medium Armillary Sphere measures 11 inches (28 cm) tall, 7 1/2 inches (19 cm) in diameter, and weighs 3.6 pounds (1.6 kg).