Hartman's Planispheric Astrolabe

Description
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).
Location
Currently not on view
Object Name
astrolabe
Date made
1537
owner
Galilei, Galileo
maker
Hartman, Georg
Physical Description
brass (overall material)
Measurements
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
Place Made
Deutschland: Bayern, Nuremberg
ID Number
MA*336117
catalog number
336117
accession number
215454
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Trigonometry
Data Source
National Museum of American History, Kenneth E. Behring Center

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