flat sphere
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Flat Earth — For other uses, see Flat Earth (disambiguation). The Flammarion engraving (1888) depicts a traveller who arrives at the edge of a flat Earth and sticks his head through the firmament … Wikipedia
Flat Earth Society — For the Belgian band, see Flat Earth Society (band). A Flat Earth model depicting Antarctica as an ice wall surrounding a disk shaped Earth. The Flat Earth Society (also known as the International Flat Earth Society or the International Flat… … Wikipedia
Flat manifold — In mathematics, a Riemannian manifold is said to be flat if its curvature is everywhere zero. Intuitively, a flat manifold is one that locally looks like Euclidean space in terms of distances and angles, e.g. the interior angles of a triangle add … Wikipedia
sphere — Poepoe, poepoepīkoi, pa a poepoe; poepoehāwa e (flat) … English-Hawaiian dictionary
Armillary sphere — An armillary sphere (variations are known as spherical astrolabe, armilla, or armil) is a model of the celestial sphere. Description and use of the armillary sphere The exterior parts of this machine are a compages of brass rings, which represent … Wikipedia
Myth of the Flat Earth — For mythologies involving the belief in a Flat Earth, see Flat Earth. The famous Flat Earth Flammarion engraving originates with Flammarion s 1888 L atmosphère: météorologie populaire (p. 163) … Wikipedia
Dyson sphere — A Dyson sphere (or shell as it appeared in the original paper) is a hypothetical megastructure originally described by Freeman Dyson. Such a sphere would be a system of orbiting solar power satellites meant to completely encompass a star and… … Wikipedia
Ewald's sphere — The Ewald sphere is a geometric construct used in electron, neutron, and X ray crystallography which neatly demonstrates the relationship between: :* the wavelength of the incident and diffracted x ray beams, :* the diffraction angle for a given… … Wikipedia
Conformally flat manifold — A (pseudo )Riemannian manifold is conformally flat if each point has a neighborhood that can be mapped to flat space by a conformal transformation. More formally, let (M, g) be a pseudo Riemannian manifold. Then (M, g) is conformally flat if for… … Wikipedia
plan|i|sphere — «PLAN uh sfihr», noun. a projection or representation of the whole or a part of a sphere on a plane, especially a map of half or more of the celestial sphere with an adjustable device to show the part of the heavens visible at a given time.… … Useful english dictionary
Trinitron Flat Tube — Pour les articles homonymes, voir TFT. La technique TFT permet de concevoir des écrans (pour ordinateurs ou téléviseurs) possédant une surface d affichage plane. Certains constructeurs de tube ont commencé par planifier l axe vertical de l… … Wikipédia en Français
