An old astronomical instrument representing the ensemble of the celestial sphere and the movement of the celestial bodies. The central globe represents Earth, and the many concentric rings (armillae) the heavenly bodies. The arrow is directed towards the pole.

In Antiquity, astronomers tried to understand the mechanism of the universe and movement of the bodies by means of the sphere.

It was used to teach astronomy, perform spherical geometry calculations and determine the position of the heavenly bodies in different periods of the year. The concept of the spheres and its positioning changed in accordance with the author's cosmologic system.

Its invention is attributed to Greek philosopher Anaximander of Miletus (611-547 b. C.)

Old instruments have always fascinated me, particularly the armillary sphere, on account of its complexity, dynamics, inventiveness and beauty.

To study it, discover its secrets and draw it always challenged me.

With the help of Jayme Machado, a competent mechanical turner and his team, I built the first sphere, having a diameter of 50 cm and which may be seen in the photos .

The central ball representing Earth was made of a water reservoir buoy. The 85cm arrow directed towards the pole is movable, which allows us to adjust it to local latitude. The rings (armillae) are made of steel.

The Ecliptic band is made of polished brass. Figures and symbols were engraved by me, using a technique of metal engraving (applying turpentine based paint, transfer of the pictures using carbon paper and removal of the paint on the lines and then submitting it to acid corrosion).

*Click on thumbnails for amplified versions*