An Italian armillary sphere
By Anonymous, 1825
- Author: Anonymous
- Publication date: c.1825
- Physical description: Wooden stand and rings, paper, brass, gores on terrestrial sphere.
- Dimensions: 350mm x 190mm in diameter
- Inventory reference: 2894
Running horizontally is another circle, marked internally with ‘circolo dell’eclittica’, and enclosed by a zodiacal strip 2.6 centimetres wide. The strip is graduated and lists the zodiacal signs with their symbols above and the gregorian calendar months below.
Six further rings (or “armillae”, in Latin) are mounted inside the outer skeleton, at the heart of which is fixed the gilt sphere representing the Sun. Furthest away from this are the ring of Saturn, then Jupiter, Mars, earth, Venus and Mercury. Earth’s globe measures 2.5 centimetres in diameter and is connected to the main axis via one brass arm that also connects it to the small disc representing the Moon. All rings can be moved around to best describe and understand their orbits. Each planetary ring is filled with information regarding the planet’s inclination, the revolution time in days, hours and minutes, and the distance to the Sun in ‘Miriamenti o Leghe Nuove’.
A similar French-language example is kept at the national Maritime Museum in Greenwich, London.
- Dekker, Elly, ‘Globes at Greenwich’, OUP, 1999, ASTO631
- Dekker, Elly. (1999). Globes at Greenwich: A Catalogue of Globes and Armillery Spheres at the National Maritime Museum in Greenwich. Oxford: Oxford University Press and the National Maritime Museum.