(astronomy, geography) The celestial or terrestrial sphere when its axis is oblique to the horizon of the place; or as it appears to an observer at any point on the earth except the poles and the equator.

A unified body or collection of knowledge regarding a specific subject.

(astronomy) An abstract sphere of infinite radius which serves as the imaginary backdrop for celestial objects, and of which the visible sky is one hemisphere.

A hypothetical system of orbiting solar power satellites meant to completely encompass a star and capture its entire energy output. / (science fiction) A solid shell of matter enclosing a star.

An instrument consisting of graduated metal circles used to represent the motions of celestial bodies around the earth.

(topology) A manifold whose homology is the same as that of some sphere of the same dimension

Alternative spelling of celestial sphere

(physics) A volume whose radius is the Debye length, in which there is a sphere of influence, and outside of which charges are electrically screened.

(astronomy) The region in which a given astronomical body dominates the attraction of satellites.

(quantum mechanics) A geometrical representation of the pure state space of a two-level quantum-mechanical system, or qubit.