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Musa, Spherical astrolabe


Mūsa (15th century)
Spherical astrolabe, 1480-1481
Oxford, Museum of the History of Science, inv. 49687

Astrolabes show the heavenly vault on a flat surface. This is the only complete example of a spherical astrolabe to have come down to us. The rete records the positions of 19 fixed stars.