12" Solid Brass Armillary Sphere Table Top Vintage Nautical Astrolabe Globe Description - An armillary sphere is a tool that can be used to solve various astronomical problems or as an educational tool to represent movements in the heavens. It was once common to use armillary spheres to teach the differences between the Ptolemaic model, named for Greek astronomer Ptolemy, and the Copernican model, named for Polish astronomer Copernicus, of the universe. An armillary sphere can be used to track the path of the sun for a given day of the year or to determine the coordinates of a star, among other things. A great collectible gift for brass item lovers,Antique lovers, sea sailors, captains, kids.This is a great gift item for birthday,christmas(X-Mas) Gift,New year eve etc. A good desktop decorative. The inner part of this armillary sphere is moveable. ALSO AVAILABLE IN 8",12" & 18" FOR PURCHASE VISIT OUR STORE FOR MANY MORE NAUTICAL,ANTIQUE,VINTAGE REPRODUCTION PRODUCTS OR CONTACT US ANY TIME. Product Features -