curvature of earth
71History of the telescope — The earliest known working telescopes appeared in 1608 and are credited to Hans Lippershey and Zacharias Janssen, spectacle makers in Middelburg, and Jacob Metius of Alkmaar. The design of these early refracting telescopes consisted of a convex… …
72Flatness — The intuitive idea of flatness is important in several fields.Flatness in mathematicsThe flatness of a surface is the degree to which it approximates a mathematical plane. The term is generalized for higher dimensional manifolds to describe the… …
73Dennis Rawlins — Born 1937 (age 73–74) Baltimore, Maryland, United States Nationality American Occupation Astronomer, Historian, Publisher Dennis Rawlins (born 1937 in Baltimore, Maryland) is an American astronomer, historian, and publisher …
74Kepler problem in general relativity — The Kepler problem in general relativity involves solving for the motion of two spherical bodies interacting with one another by gravitation, as described by the theory of general relativity.Typically, and in this article, one body is assumed to… …
75climate — /kluy mit/, n. 1. the composite or generally prevailing weather conditions of a region, as temperature, air pressure, humidity, precipitation, sunshine, cloudiness, and winds, throughout the year, averaged over a series of years. 2. a region or… …
76mechanics — /meuh kan iks/, n. 1. (used with a sing. v.) the branch of physics that deals with the action of forces on bodies and with motion, comprised of kinetics, statics, and kinematics. 2. (used with a sing. v.) the theoretical and practical application …
77History of geodesy — See also the main article on Geodesy. Humanity has always been interested in the Earth. During very early times this interest was limited, naturally, to the immediate vicinity of home and residency, and the fact that we live on a near spherical… …
78ger-3 — ger 3 English meaning: to turn, wind Deutsche Übersetzung: “drehen, winden” Material: A. O.Ind. guṇá ḥ (*gr̥ nó s) “ the single thread of a string, line, cord; stain “ (dvi , tri guṇa actually “ consisting of two, three threads …
79Interstellar travel — Montage of fusion powered rocket concepts from 1987–2004, which could form the basis for an interstellar vehicle. Included are: VISTA (Lawrence Livermore National Laboratories,1987), Discovery II (NASA/GRC, 2002), Human Outer Planet Exploration… …
80Orbit — This article is about orbits in celestial mechanics, due to gravity. For other uses, see Orbit (disambiguation). A satellite orbiting the Earth has a tangential velocity and an inward acceleration …
