Antique Globe -Armillary sphere- Weber Costello 1921 (reproduction) or old globe or historical globe Contact Customer Service    
Antique Globe -Armillary sphere- Weber Costello 1921 (reproduction) from AM.
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Antique Globe -Armillary sphere- Weber Costello 1921 (reproduction)

Geodus price: 89.00 €
 
Relative dimensions of the object compared to a person of 1,70m (67"). Small objects are on a table.
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Brand: AM       ( Ref: GL030 )

Overall height: 33 cm  (13 in.)
Overall width: 19 cm  (7.5 in.)
Weight: 0.77 kg  (1.7 lb)

Base: wood / bronze
Rings: bronze


On the Properties of Things (De proprietatibus rerum). Bartholomeus Anglicus (Bartholomew of England) about 1430 An armillary sphere is a representation of the antique concept of celestial sphere or orbs, invented by greek philosophers.
The Firmament was assimilated to a sphere centered on Earth. During Antiquity and the Middle Ages, the stars were considered as equidistant from the center and an armillary sphere was assumed to be an exact representation of the universe. Even if now know that this model is wrong, it remains a very practical abstraction for the astronomy of position.

The exterior parts of this machine are a compages of rings and axes, which represent the principal circles of the heavens:
 the polar axis
 an horizontal disc representing the horizon of the place
 particular parallels as the equator, the 2 polar circles and the 2 tropics
 the ecliptic, apparent way of the Sun in the sky

The Earth is represented by a ball placed in its center on the polar axis.

These machines were used as teaching tools and, for the largest of them, as observation instruments, in particular by Ptolemaeus.

The paintings of the scientists and the notables of the Renaissance often show them with a hand on an armillary sphere which represented the top of knowledge and wisdom.
About spheres and calendars published in 1804

“About spheres and calendars” from D.F. de Rivard (1804, in french), explaining the use of an armillary sphere can be consulted on-line (google-scan) here or downloaded here.


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Antique Globe -Armillary Sphere- of the 18th century (reproduction) from AM.
Antique Globe -Armillary Sphere- of the 18th century (reproduction)

Geodus price: 149.00 €
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