celestial+equator
31Celestial 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… …
32Equator — E*qua tor, n. [L. aequator one who equalizes: cf. F. [ e]quateur equator. See {Equate}.] 1. (Geog.) The imaginary great circle on the earth s surface, everywhere equally distant from the two poles, and dividing the earth s surface into two… …
33Equator of a planet — Equator E*qua tor, n. [L. aequator one who equalizes: cf. F. [ e]quateur equator. See {Equate}.] 1. (Geog.) The imaginary great circle on the earth s surface, everywhere equally distant from the two poles, and dividing the earth s surface into… …
34Equator of the sun — Equator E*qua tor, n. [L. aequator one who equalizes: cf. F. [ e]quateur equator. See {Equate}.] 1. (Geog.) The imaginary great circle on the earth s surface, everywhere equally distant from the two poles, and dividing the earth s surface into… …
35celestial 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… …
36equator — noun Etymology: Middle English, from Medieval Latin aequator, literally, equalizer, from Latin aequare Date: 14th century 1. the great circle of the celestial sphere whose plane is perpendicular to the axis of the earth 2. a great circle of the… …
37celestial coordinate — noun : a member of any system of coordinates used for locating a point on the celestial sphere compare ecliptic coordinate, equator system of coordinate, galactic coordinate, horizon coordinate …
38equator — noun /iːˈkweitɔː,ɛˈkweitɔː/ a) An imaginary great circle around the earth, equidistant from the two poles, and dividing earths surface into the northern and southern hemisphere. b) A similar great circle on any sphere, especially on a celestial… …
39Equinox (celestial coordinates) — In astronomy, equinox is a moment in time at which the vernal point, celestial equator, and other such elements are taken to be used in the definition of a celestial coordinate system. The position at other equinoxes can be computed by taking… …
40galactic equator — Astron. the great circle on the celestial sphere that is equidistant from the galactic poles, being inclined approximately 62° to the celestial equator and lying about one degree north of the center line of the Milky Way. Also called galactic… …
