C5386

Mariner's astrolabe Long Caption: The mariner's astrolabe was a simplified version of an instrument originally developed by Arab astronomers for measuring the height of heavenly bodies above the horizon and came into use in navigation by about 1470. In order to keep it steady when used on board ship, the mariner's version was heavier and had parts of the disc cut away to reduce wind resistance. Credit line: © National Maritime Museum, Greenwich, London Object: NAV0022 Artist: unknown Date: circa 1588 Medium: brass Size: diameter: 178 mm Click here to buy a bespoke print of this image.