Earth ellipsoid

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• Earth ellipsoid — The Earth ellipsoid especially the mean Earth ellipsoid is the mathematical figure of the Earth which is used as a reference frame for computations in geodesy, astronomy and the geosciences.It is a ellipsoid of rotation, whose short (polar) axis… …   Wikipedia

• Earth's rotation — is the rotation of the solid Earth around its own axis. The Earth rotates towards the east, which can be observed by orientation with a magnetic compass at sunrise. As viewed from the star Polaris, the Earth turns counter clockwise. Rotation… …   Wikipedia

• Earth radius — The Earth s shape, like that of all major planets, approximates a sphere. A true sphere has a unique radius, but on Earth the distance from the mean sea level at each point on the surface to the center (the radius of the Earth at a point on the… …   Wikipedia

• Ellipsoid — This article is about the shape. For the type of theatrical spotlight, see ellipsoidal reflector spotlight. For the surface that approximates the figure of the Earth, see reference ellipsoid. triaxial redirects here. For the electrical cable, see …   Wikipedia

• ellipsoid — /i lip soyd/, n. 1. Geom. a solid figure all plane sections of which are ellipses or circles. Typical equation: (x2/a2) + (y2/b2) + (z2/c2) = 1. adj. 2. ellipsoidal. [1715 25; < F ellipsoïde. See ELLIPSE, OID] * * * ▪ geometry       closed… …   Universalium

• ellipsoid — 1. noun a) a surface, all of whose cross sections are elliptic or circular (includes the sphere) Here the geoid is thirty meters below the ellipsoid. b) Such a surface used as a model of the shape of the …   Wiktionary

• Figure of the Earth — An oblate spheroid Geodesy …   Wikipedia

• Reference ellipsoid — In geodesy, a reference ellipsoid is a mathematically defined surface that approximates the geoid, the truer figure of the Earth, or other planetary body.Because of their relative simplicity, reference ellipsoids are used as a preferred surface… …   Wikipedia

• Bessel ellipsoid — The Bessel ellipsoid (or Bessel 1841) is an important reference ellipsoid of geodesy. It is currently used by several national surveys of Europe and on other continents, but will be replaced in the next decades by modern ellipsoids of satellite… …   Wikipedia

• Spherical Earth — Medieval artistic representation of a spherical Earth with compartments representing earth, air, and water (c. 1400). The concept of a spherical Earth dates back to ancient Greek philosophy from around the 6th century BC …   Wikipedia

• Oblate ellipsoid — Oblate Ob*late , a. [L. oblatus, used as p. p. of offerre to bring forward, offer, dedicate; ob (see {Ob }) + latus borne, for tlatus. See {Tolerate}.] [1913 Webster] 1. (Geom.) Flattened or depressed at the poles; as, the earth is an oblate… …   The Collaborative International Dictionary of English