Hartman's Planispheric Astrolabe

The astrolabe is an astronomical calculating device used from ancient times into the eighteenth century. Measuring the height of a star using the back of the instrument, and knowing the latitude, one could find the time of night and the position of other stars. The openwork piece on the front, called the rete, is a star map of the northern sky. Pointers on the rete correspond to stars; the outermost circle is the Tropic of Capricorn, and the circle that is off-center represents the zodiac, the apparent annual motion of the sun. Engraved plates that fit below the rete have scales of altitude and azimuth (arc of the horizon) for specific latitudes. This brass astrolabe has four plates; one may well be a replacement. It was made in Nuremberg by Georg Hartman in 1537. An inscription on the inside of the instrument states that it once belonged to the Italian mathematician and astronomer Galileo Galilei (1564-1642).
Currently not on view
Date made
possible owner
Galilei, Galileo
Hartman, Georg
Place Made
Deutschland: Bayern, Nuremberg
Physical Description
brass (overall material)
overall: 22.5 cm x 16.1 cm x 1.3 cm; 8 27/32 in x 6 11/32 in x 1/2 in
ID Number
catalog number
accession number
Credit Line
Gift of International Business Machines Corporation
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Data Source
National Museum of American History


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