Brass Armillary Sphere, c.1801 [image 1 of 2]
Description
The armillary sphere is an ancient instrument, dating back to the time of Ptolemy (AD 107-161), and is used by a ship's navigator to make astronomical observations. The brass rings bear engravings which represent the equator, tropics and poles of the earth, and the movements of the sun, moon, stars and planets.
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