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An armillary sphere (variations are known as spherical astrolabe, armilla, or armil) is a model of objects in the sky (in the celestial sphere), consisting of a spherical framework of rings, centred on Earth, that represent lines of celestial longitude and latitude and other astronomically important features such as the ecliptic. As such, it differs from a celestial globe, which is a smooth sphere whose principal purpose is to map the constellations. Read more on wikipedia.

Armillary Sphere Signed by Antonio Santucci Constructed 1588 to Florence Wood and metal; 2420 mm in diameter. © Istituto e Museo di Storia della Scienza, Firenze. Epact: Scientific Instruments of Medieval and Renaissance Europe