each of the two points in which the extended axis of the earth cuts the celestial sphere and about which the stars seem to revolve.
either of the two points at which the earth’s axis, extended to infinity, would intersect the celestial sphere Sometimes shortened to pole
Either of the two points at which a northward or southward projection of the Earth’s axis intersects the celestial sphere. The north and south celestial poles are analogous to Earth’s geographic poles and are used in determining right ascension in the equatorial coordinate system. Depending on which hemisphere an observer is in, the stars and other celestial objects appear to revolve once around the north or south celestial pole every 24 hours, an effect produced by the rotation of the Earth on its axis. Because of the precession of Earth’s axis, the celestial poles gradually shift position in the sky over a nearly 26,000-year cycle.
the imaginary spherical shell formed by the sky, usually represented as an infinite sphere, the center of which is a given observer’s position. noun an imaginary sphere of infinitely large radius enclosing the universe so that all celestial bodies appear to be projected onto its surface celestial sphere An imaginary sphere with Earth at its […]
a transparent celluloid sheet on which a character, scene, etc., is drawn or painted and which constitutes one frame in the filming of an animated cartoon: may be overlapped for change of background or foreground. Historical Examples noun short for celluloid (sense 2b), celluloid (sense 2c) n. “celluloid sheet for an animated cartoon,” from celluloid; […]
cincture (defs 1, 2).
cincture (defs 1, 2). Historical Examples