axis of the celestial sphere

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• Celestial sphere — [ celestial equator.] In astronomy and navigation, the celestial sphere is an imaginary rotating sphere of gigantic radius , concentric and coaxial with the Earth. All objects in the sky can be thought of as lying upon the sphere. Projected from… …   Wikipedia

• celestial sphere — the imaginary spherical shell formed by the sky, usually represented as an infinite sphere, the center of which is a given observer s position. [1875 80] * * * Apparent surface of the heavens, on which the stars seem to be fixed. For the purpose… …   Universalium

• Dynamics of the celestial spheres — Fourteenth century drawing of angels turning the celestial spheres Ancient, medieval and Renaissance astronomers and philosophers developed many different theories about the dynamics of the celestial spheres. They explained the motions of the… …   Wikipedia

• celestial pole — noun one of two points of intersection of the Earth s axis and the celestial sphere • Syn: ↑pole • Hypernyms: ↑celestial point • Instance Hyponyms: ↑north celestial pole, ↑south celestial pole …   Useful english dictionary

• celestial pole — noun An imaginary point situated where a planets axis intersects the celestial sphere …   Wiktionary

• Celestial pole — The north and south celestial poles and their relation to axis of rotation, plane of orbit and axial tilt …   Wikipedia

• celestial poles — The point on the celestial sphere where the earth’s axis, if projected, would intersect the celestial sphere …   Aviation dictionary

• celestial poles — plural noun (astronomy) The two points at which the earth s axis, extended indefinitely, cuts the celestial sphere • • • Main Entry: ↑celestial …   Useful english dictionary

• celestial pole — n. either of two points on the celestial sphere where the extensions of the earth s axis would intersect: see DECLINATION …   English World dictionary

• Celestial coordinate system — For other uses of Celestial , see Celestial (disambiguation). Orientation of Astronomical Coordinates Orientation of the galactic, ecliptic and equatorial coordinate systems, projected on the celestial sphere, showing the galactic equator (black) …   Wikipedia

• Celestial poles — Pole Pole, n. [L. polus, Gr. ? a pivot or hinge on which anything turns, an axis, a pole; akin to ? to move: cf. F. p[^o]le.] 1. Either extremity of an axis of a sphere; especially, one of the extremities of the earth s axis; as, the north pole.… …   The Collaborative International Dictionary of English