Source: wikibot/celestial-spheres
= Celestial spheres
{wiki=Celestial_spheres}
Celestial spheres are an ancient astronomical concept used to describe the apparent motions of celestial bodies in space as though they are projected onto an imaginary sphere surrounding the Earth. In this model, the Earth is at the center, and the stars, planets, Sun, and Moon are considered to be located on the inner surface of this giant sphere, known as the celestial sphere.