Nglenjarman
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Sand Hourglass, Hourglass Timer, Clocks, Vintage, Watches

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.

An armillary sphere (variations are known as spherical astrolabe, armilla, or…

The Antonio Santucci Armillary Sphere

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

French, late 19th century

French, Driven by clockwork, devised th effect o/t motion o/t earth & obliquity f its axis in causing th alternation f day & night & succession o/t seasons. 2 teach "th use o/t globes", aka elementary astronomy