The world's first water-powered celestial globe was created by Zhang Heng, who operated his armillary sphere by use of an inflow clepsydra clock. Subsequent developments were made after the Han …

Aug 21, 2022 · In this article, we'll explore how the armillary sphere works, what the rings on it show, and how it helps visualize the movement of the Sun on the celestial sphere.

armillary sphere, early astronomical device for representing the great circles of the heavens, including in the most elaborate instruments the horizon, meridian, Equator, tropics, polar circles, and an ecliptic …

Apr 29, 2025 · Armillary spheres are ancient tools used to model the movement of celestial objects in the sky. Armillary spheres date back to ancient Greece and China and became more sophisticated in …

With this demo you can explain the motions of the stars and of the Sun, and show various aspects of the seasons. The main features of the sphere itself are shown schematically in figure 1.

The meaning of ARMILLARY SPHERE is an old astronomical instrument composed of rings showing the positions of important circles of the celestial sphere.

Mar 25, 2026 · An armillary sphere is an astronomical device made up of a number of rings linked to a pole. These rings represent the circles of the celestial sphere, such as the equator, the ecliptic and …

Armillary spheres date back to the ancients, and were certainly used by the 2nd-century astronomer and mathematician Claudius Ptolemy of Alexandria. They were mathematical instruments designed to …

The word “armillary” comes from the Latin armilla, meaning bracelets or rings – think of the back of an armadillo or overlapping rings of armour – an apt description of the sphere’s structure, which is made …

Armillary spheres are models of the universe. They have been used since antiquity, but very few survive from before the 16th century. The Whipple Museum has one very early example, though dating it …