Useful english dictionary. 2012.
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
point of apoapsis — noun (astronomy) the point in an orbit farthest from the body being orbited • Syn: ↑apoapsis • Ant: ↑point of periapsis, ↑periapsis (for: ↑apoapsis) • Top … Useful english dictionary
point of periapsis — noun (astronomy) the point in an orbit closest to the body being orbited • Syn: ↑periapsis • Ant: ↑point of apoapsis, ↑apoapsis (for: ↑periapsis) • Topic … Useful english dictionary
celestial sphere — noun the apparent surface of the imaginary sphere on which celestial bodies appear to be projected • Syn: ↑sphere, ↑empyrean, ↑firmament, ↑heavens, ↑vault of heaven, ↑welkin • Derivationally related forms: ↑firmamental … Useful english dictionary
Celestial mechanics — is the branch of astrophysics that deals with the motions of celestial objects. The field applies principles of physics, historically classical mechanics, to astronomical objects such as stars and planets to produce ephemeris data. Orbital… … Wikipedia
Celestial meridiator — is a vertical imaginary line that goes over the celestial poles and crosses (perpendicular to) the celestial equator. There are two celestial meridiators on the celestial sphere: Equinox meridiator and Solstice meridiator.NameThe meridiators are… … Wikipedia
Celestial navigation — Celestial navigation, also known as astronavigation, is a position fixing technique that was devised to help sailors cross the featureless oceans without having to rely on dead reckoning to enable them to strike land. Celestial navigation uses… … Wikipedia
celestial longitude — n. Astron. the arc of the ecliptic measured eastward from the vernal equinox to the point where the ecliptic is intersected by the great circle through the star, planet, etc. and the poles of the ecliptic … English World dictionary
celestial mechanics — the branch of astronomy that deals with the application of the laws of dynamics and Newton s law of gravitation to the motions of heavenly bodies. [1815 25] * * * Branch of astronomy that deals with the mathematical theory of the motions of… … Universalium
Celestial pole — The north and south celestial poles and their relation to axis of rotation, plane of orbit and axial tilt … Wikipedia
