Armillary spheres are dated back to the ancients, with the first ones dated as far as 200bc and it was certainly used by the 2nd-century astronomer and mathematician Claudius Ptolemy of Alexandria (100ad). It was a mathematical instrument designed to demonstrate the movement of the celestial sphere about a stationary Earth at its centre.
The concept of the celestial sphere was fundamental to astronomy from Antiquity through the Middle Ages and into the early Modern era. At the centre of the sphere is the Earth. As the Earth is stationary in this model, it is the celestial sphere which rotates about it and acts as a reference system for locating the celestial bodies – stars, in particular – from a geocentric perspective.
The sphere is a skeleton celestial globe, with circles divided into degrees for angular measurement and representing the great circles of the heavens, including in the most elaborate instruments the horizon, meridian, Equator, tropics, polar circles, and an ecliptic hoop.
Each of the signs of the zodiac is engraved upon the ecliptic ring which is also calibrated with a calendar scale enabling the instrument to be used to model the apparent motion of the sun and the stars at any time of the year. The instrument could be used not only to model the movements and relative geometry of the heavens, but to carry out all sorts of calculations such as the times of sunrise and sunset, the length of a day, and the altitude of the sun or stars.
Beautifully crafted, made of solid brass with wooden stand
Please watch Video to see the rotation.
would be a great decorative addition to any enthusiastic collector
Item is antiquated not an antique.
Height: 22 cm
Sphere Diameter: 15cm
Base Diameter: 11 cm
Item Weight: 750gr
Uses For Occasions
Graduation day gift, Father’s Day gift, Gift for special man, Anniversary gift, Groomsmen Gift, Valentine’s Day gift, Personalized gift for men, Christmas Gift, Nautical décor, camping gift for man and woman, Promotion Day gift.
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Brand: Royal Handicraft
Colour: As Shown in Picture
Condition: New
Style: Vintage
Fast Delivery: Available
