The remotest major planet of our solar system, discovered -- as a result of the computations of Leverrier, of Paris -- by Galle, of Berlin, September 23, 1846. It is classed as a gas giant, and has a radius of 22,716 km and an estimated mass of 1.027 x 1026 kg, with an average density of 2.27 g/cc. Its mean distance from the sun is about 5,000,000,000 km (3,106,856,000 miles), and its period of revolution is about 164.78 years.
One coat of arms has the figure of Neptune thus minutely described, believed to have reference to an escape from shipwreck. Argent, a Neptune crowned with an Eastern crown of gold, his Trident sable headed or, issuing from a stormy ocean, the sinister hand grasping the head of a ship's mast appearing above the waves as part of the wreck, all proper; on a chief azure, the arctic polar star of the first between two water bougets of the second--HEARD, co. Somerset[Lancaster Herald, afterwards Garter King of Arms, granted 1762].