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Ibrhm ibn Sa‘d al-Sahl al-Wazzn, Celestial globe


Ibrhm ibn Sad al-Sahl al-Wazzn (11th century)
Celestial globe, Valencia, 1085 (478 A.H.)
Florence, Istituto e Museo di Storia della Scienza, inv. 2712

This globe is the oldest surviving Islamic instrument of its kind. It depicts 47 of the 48 classical constellations, it contains 1,015 of the 1,025 stars catalogued by Ptolemy, and it shows the maximum circumference of the equator and of the ecliptic as well as the Arctic and Antarctic polar circles. The adjacent carousel shows the 12 beautifully engraved plates that make up the globe.