ellipticity of the Earth

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

• Ellipticity — El lip*tic i*ty, n. [Cf. F. ellipticit[ e].] Deviation of an ellipse or a spheroid from the form of a circle or a sphere; especially, in reference to the figure of the earth, the difference between the equatorial and polar semidiameters, divided… …   The Collaborative International Dictionary of English

• Equation of the center — The equation of the center, in astronomy and elliptical motion, is equal to the true anomaly minus the mean anomaly, i.e. the difference between the actual angular position in the elliptical orbit and the position the orbiting body would have if… …   Wikipedia

• Milankovich , Milutin — (1879–1958) Yugoslavian mathematician Milankovich was born at Dalj in Croatia and was educated at the Institute of Technology in Vienna, where he obtained his PhD in 1904. He then moved to the University of Belgrade, remaining there for the rest… …   Scientists

• Pendulum — This article is about pendulums. For other uses, see Pendulum (disambiguation). Simple gravity pendulum model assumes no friction or air resistance …   Wikipedia

• Geodesy — (pronEng|dʒiːˈɒdɪsi [OED] ), also called geodetics, a branch of earth sciences, is the scientific discipline that deals with the measurement and representation of the Earth, including its gravitational field, in a three dimensional time varying… …   Wikipedia

• Sundial — A sundial is a device that measures time by the position of the Sun. In common designs such as the horizontal sundial, the sun casts a shadow from its style (a thin rod or a sharp, straight edge) onto a flat surface marked with lines indicating… …   Wikipedia

• Solar time — On a prograde planet like the Earth, the sidereal day is shorter than the solar day. At time 1, the Sun and a certain distant …   Wikipedia

• Orbital station-keeping — In astrodynamics orbital station keeping is a term used to describe the orbital maneuvers made by thruster burns that are needed to keep a spacecraft in a particular assigned orbit. For many Earth satellites the effects of the non Keplerian… …   Wikipedia

• Clairaut's theorem — For the interpretation of this theorem in terms of symmetry of second derivatives of a mapping , see Symmetry of second derivatives. Figure 1: An ellipsoid …   Wikipedia

• Bessel, Friedrich Wilhelm — born July 22, 1784, Minden, Brandenburg died March 17, 1846, Königsberg, Prussia German astronomer. He was the first to measure (by means of parallax) the distance to a star other than the Sun. One of his major discoveries was that the bright… …   Universalium