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It takes ts name because the parameter of its construction is based on the altitude of the Sun
featuring a compass and cotton shadow line
It's used by measuring the height of a star using the back of the instrument
The compass is crafted of a wooden base with brass lid
This instrument is based on the eastern astrolabe now in the collection of the Adler Planetarium in Chicago made by the famous craftsman Diyal'al Din Muhammad in 1647
Hartmann's Astrolabe - Key Ring It takes ts name becausePlanispheric (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