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featuring a compass and cotton shadow line
explaining its use and historical context
The Spanish astronomer and mathematician Juan de Rojas presented to the European public the Orthographic Projection (1550)
The Nocturnal is available in a larger desk model and key chain version
Fashioned of brass with a brass key ring and featuring a compass rose on the reverse
Hartmann's Astrolabe - Key Ring featuring a compass and cottonPlanispheric (Catholic or European) astrolabe, set for 50 North latitude. Stars and other features updated to make it functional. This beautiful astrolabe is based on the work of Georg Hartman a sixteenth century astronomer from Nuremberg, Germany. The astrolabe is an astronomical calculating device used from ancient times into the eighteenth century. It's used by measuring the height of a star using the back of the instrument, and knowing the