Figure 1: Islamic Celestial Globe in brass, dated 1630 CE. This globe served both as a map of the heavens, as viewed from outside the starry sphere, and as a precision tool for making astronomical calculations. Engraved on its surface are various coordinate lines, constellation figures, and Arabic inscriptions. The stars are made of embedded bits of silver. The globe is hollow and was cast in one seamless piece. Source: http://www.nasm.si.edu/exploretheuniverse/etu_ne.htm.
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