The helicopter Co. Brass Antique Style Brass Armillary Sphere Astrolabe Nautical Spheres/Globes is a beautiful Table Decor with Realistic Functional properties The Beautifully done Axillary globe is completely functioning despite being a decor for your tables and shelves. It has become an icon of science with its elegant rings and beautiful silhouettes. Eratosthenes may have invented the armillary spheres around 255 BC. These instruments are made up of a set of graduated rings representing circles on the celestial sphere, such as the meridian, equator, ecliptic horizon, tropics, and colures. With the aid of an armillary sphere, one can track the path of the Sun for any given day of the year or determine a star's coordinates. The earth is represented by the brass sphere located at the centre of the armillary sphere. This Elegant reproduction of European Demonstrational Armillary Sphere shows a relationship among the significant lines and points of the sky. The Solid Brass Armillary sphere features a rich patina finish that will not tarnish or show fingerprints upon touching. The heavy solid rosewood base has been floored with a premium velvet patch which won't let this decor sphere slip or drag away easily on slippery surfaces