celestial+equator
91right ascension — Astron. the arc of the celestial equator measured eastward from the vernal equinox to the foot of the great circle passing through the celestial poles and a given point on the celestial sphere, expressed in degrees or hours. [1585 95] * * * ▪… …
92Latitude — This article is about the geographical reference system. For other uses, see Latitude (disambiguation). Map of Earth Longitude (λ) Lines of longitude appear vertical with varying curvature in this projection, but are actually halves of great… …
93galactic coordinate — In astronomy, a galactic latitude or longitude, useful for describing the relative positions and motions of components of the Milky Way Galaxy. Galactic latitude is measured in degrees north or south of the plane of the Milky Way. Galactic… …
94Earth Centered Inertial — The Earth Centered Inertial (ECI) Frame is a non rotating version of the (ECEF) frame. The ECI frame is identical to the ECEF frame at some instant in time. The ECI frame is a convenient inertial frame for which Newton s second law is valid, and… …
95equinoctial — 1. adjective a) of, or relating to an equinox b) of, or relating to the celestial or terrestrial equator 2. noun a) the …
96equinoctial — e·qui·noc·tial || ‚iËkwɪ nÉ’kʃl n. violent rainstorm at or near the time of the equinox; celestial equator, large circle surrounding the celestial sphere equidistant from the celestial poles adj. pertaining to a day characterized by equal …
97tropic — /ˈtrɒpɪk / (say tropik) noun 1. Geography a. either of two corresponding parallels of latitude on the terrestrial globe, one (Tropic of Cancer) about 23½° north, and the other (Tropic of Capricorn) about 23½° south of the equator, being the… …
98galactic longitude — noun : longitude in the system of galactic coordinates measured in degrees eastward from the point where the galactic equator crosses the celestial equator in the constellation Aquila * * * Astron. the angular distance in degrees measured… …
99hem|i|sphere — «HEHM uh sfihr», noun. 1. a half sphere or globe, formed by a plane passing through the center. 2. a) half of the earth s surface. North America and South America are in the Western Hemisphere; Europe, Asia, Africa, and Australia are in the… …
100Polar distance (astronomy) — Polar distance (PD) is an astronomical term associated with the celestial equatorial coordinate system Σ(α, δ) and it is an angular distance of a celestial object on its meridian measured from the celestial pole, similar as declination (dec, δ)… …
