The armillary sphere is an ancient astronomical instrument reproducing a model of the celestial sphere. In its simplest form, it was known since the antiquity. The article presents the principle of its drawing and use, as displayed in Muslim heritage, and hence shows the concentrate of scientific knowledge that lies behind the apparent simplicity of the instrument.
The Armillary Sphere: A Concentrate of Knowledge in Islamic Astronomy
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Figure 1. The Tabula Rogeriana, drawn by al-Idrisi for Roger II of Sicily in 1154, one of the most advanced ancient world maps. Modern consolidation, created from the 70 double-page spreads of the original atlas. (Source)
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