Celestial spheres or planetary spheres, refer to a geocentric model of the universe and the associated postulate of a "Musica Universalis" (Music of the Spheres)
Hill sphere, the spherical region around an astronomical body where the primary gravitational influence on an orbiting object is that body
This disambiguation page lists articles associated with the title Sphere. If an internal link led you here, you may wish to change the link to point directly to the intended article.