half-sphere
11Poincaré half-plane model — Stellated regular heptagonal tiling of the model.In non Euclidean geometry, the Poincaré half plane model is the upper half plane, together with a metric, the Poincaré metric, that makes it a model of two dimensional hyperbolic geometry.It is… …
12plan|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.… …
13Oblique sphere — Oblique Ob*lique , a. [F., fr. L. obliquus; ob (see {Ob }) + liquis oblique; cf. licinus bent upward, Gr. le chrios slanting.] [Written also {oblike}.] [1913 Webster] 1. Not erect or perpendicular; neither parallel to, nor at right angles from,… …
14celestial sphere — noun Date: 1829 an imaginary sphere of infinite radius against which the celestial bodies appear to be projected and of which the apparent dome of the visible sky forms half …
15Unit disk — For other uses, see Disc (disambiguation). An open Euclidean unit disk In mathematics, the open unit disk (or disc) around P (where P is a given point in the plane), is the set of points whose distance from P is less than 1 …
16Pope Sylvester II — Infobox Pope English name=Sylvester II birth name=Gerbert d Aurillac term start=April 2, 999 term end=May 12, 1003 predecessor=Gregory V successor=John XVII birth date= ca. 950 birthplace=Auvergne, France dead=dead|death date=death… …
17Cavalieri's principle — Two stacks of coins with the same volume In geometry, Cavalieri s principle, sometimes called the method of indivisibles, named after Bonaventura Cavalieri, is as follows:[1] 2 dimensional case: Suppose two regions in a plane are included between …
18Cerebral hemispheres — Hemisphere Hem i*sphere, n. [L. hemisphaerium, Gr. ?; ? half = ? sphere: cf. F. h[ e]misph[ e]re. See {Hemi }, and {Sphere}.] 1. A half sphere; one half of a sphere or globe, when divided by a plane passing through its center. [1913 Webster] 2.… …
19Hemisphere — Hem i*sphere, n. [L. hemisphaerium, Gr. ?; ? half = ? sphere: cf. F. h[ e]misph[ e]re. See {Hemi }, and {Sphere}.] 1. A half sphere; one half of a sphere or globe, when divided by a plane passing through its center. [1913 Webster] 2. Half of the… …
20Magdeburg hemispheres — Hemisphere Hem i*sphere, n. [L. hemisphaerium, Gr. ?; ? half = ? sphere: cf. F. h[ e]misph[ e]re. See {Hemi }, and {Sphere}.] 1. A half sphere; one half of a sphere or globe, when divided by a plane passing through its center. [1913 Webster] 2.… …
