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Eight-pointed Star
In geometry, an octagram is an eight-angled star polygon. The name ''octagram'' combine a Greek numeral prefix, ''wikt:octa-, octa-'', with the Greek language, Greek suffix ''wikt:-gram, -gram''. The ''-gram'' suffix derives from γραμμή (''grammḗ'') meaning "line". Detail In general, an octagram is any self-intersecting octagon (8-sided polygon). The regular polygon, regular octagram is labeled by the Schläfli symbol , which means an 8-sided star, connected by every third point. Variations These variations have a lower dihedral, Dih4, symmetry: The symbol Rub el Hizb is a Unicode glyph ۞ at U+06DE. As a quasitruncated square Deeper truncations of the square can produce isogonal (vertex-transitive) intermediate star polygon forms with equal spaced vertices and two edge lengths. A truncated square is an octagon, t=. A quasitruncated square, inverted as , is an octagram, t=.The Lighter Side of Mathematics: Proceedings of the Eugène Strens Memorial Conference ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geometry
Geometry (; ) is a branch of mathematics concerned with properties of space such as the distance, shape, size, and relative position of figures. Geometry is, along with arithmetic, one of the oldest branches of mathematics. A mathematician who works in the field of geometry is called a ''List of geometers, geometer''. Until the 19th century, geometry was almost exclusively devoted to Euclidean geometry, which includes the notions of point (geometry), point, line (geometry), line, plane (geometry), plane, distance, angle, surface (mathematics), surface, and curve, as fundamental concepts. Originally developed to model the physical world, geometry has applications in almost all sciences, and also in art, architecture, and other activities that are related to graphics. Geometry also has applications in areas of mathematics that are apparently unrelated. For example, methods of algebraic geometry are fundamental in Wiles's proof of Fermat's Last Theorem, Wiles's proof of Fermat's ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flag Of Chile
The flag of Chile consists of two equal-height horizontal bands of white and red, with a blue square the same height as the white band in the canton (flag), canton, which bears a white five-pointed star in its center. It was adopted on 18 October 1817. The Chilean flag is also known in Spanish as ''La Estrella Solitaria'' (''The Lone Star''). It has a 3:2 ratio between length and width, it is divided horizontally into two bands of equal height (the lower being red). The upper area is divided once: into a square (blue), with a single centered white star; and into a rectangle (white), whose lengths are in proportion 1:2. It is in the Flag families#Stars and Stripes, stars and stripes flag family. The star represents Venus, significant to the country's indigenous Mapuches, symbolizing a guide to progress and honor while other interpretations say it refers to an independent state; blue symbolizes the sky and the Pacific Ocean, white is for the snow-covered Andes, and red stands fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stellated Truncated Hexahedron
In geometry, the stellated truncated hexahedron (or quasitruncated hexahedron, and stellatruncated cube) is a uniform star polyhedron, indexed as U19. It has 14 faces (8 triangles and 6 octagrams), 36 edges, and 24 vertices. It is represented by Schläfli symbol t' or t, and Coxeter-Dynkin diagram, . It is sometimes called quasitruncated hexahedron because it is related to the truncated cube, , except that the square faces become inverted into octagrams. Even though the stellated truncated hexahedron is a stellation of the truncated hexahedron, its core is a regular octahedron. Orthographic projections Related polyhedra It shares the vertex arrangement with three other uniform polyhedra: the convex rhombicuboctahedron, the small rhombihexahedron In geometry, the small rhombihexahedron (or small rhombicube) is a nonconvex uniform polyhedron, indexed as U18. It has 18 faces (12 squares and 6 octagons), 48 edges, and 24 vertices. Its vertex figure is an antiparallelogr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Star Polyhedron
In geometry, a star polyhedron is a polyhedron which has some repetitive quality of nonconvex polygon, nonconvexity giving it a star-like visual quality. There are two general kinds of star polyhedron: *Polyhedra which self-intersect in a repetitive way. *Concave polyhedra of a particular kind which alternate convex and concave or saddle vertices in a repetitive way. Mathematically these figures are examples of star domains. Mathematical studies of star polyhedra are usually concerned with regular polyhedron, regular, Uniform polyhedron, uniform polyhedra, or the Dual polyhedron, duals of the uniform polyhedra. All these stars are of the self-intersecting kind. Self-intersecting star polyhedra Regular star polyhedra The regular star polyhedra are self-intersecting polyhedra. They may either have self-intersecting Face (geometry), faces, or self-intersecting vertex figures. There are four List of regular polytopes and compounds#Three dimensions 2, regular star polyhedra, known ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Branko Grünbaum
Branko Grünbaum (; 2 October 1929 – 14 September 2018) was a Croatian-born mathematician of Jewish descentBranko Grünbaum Hrvatska enciklopedija LZMK. and a professor at the in . He received his Ph.D. in 1957 from Hebrew University of Jerusalem. Life< ...
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Unicode
Unicode or ''The Unicode Standard'' or TUS is a character encoding standard maintained by the Unicode Consortium designed to support the use of text in all of the world's writing systems that can be digitized. Version 16.0 defines 154,998 Character (computing), characters and 168 script (Unicode), scripts used in various ordinary, literary, academic, and technical contexts. Unicode has largely supplanted the previous environment of a myriad of incompatible character sets used within different locales and on different computer architectures. The entire repertoire of these sets, plus many additional characters, were merged into the single Unicode set. Unicode is used to encode the vast majority of text on the Internet, including most web pages, and relevant Unicode support has become a common consideration in contemporary software development. Unicode is ultimately capable of encoding more than 1.1 million characters. The Unicode character repertoire is synchronized with Univers ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Compass Rose
A compass rose or compass star, sometimes called a wind rose or rose of the winds, is a polar coordinates, polar diagram displaying the orientation of the cardinal directions (north, east, south, and west) and their points of the compass, intermediate points. It is used on compass, compasses (including magnetic compass, magnetic ones), maps (such as compass rose networks), or monuments. It is particularly common in navigation systems, including nautical charts, non-directional beacons (NDB), VHF omnidirectional range (VOR) systems, satellite navigation devices ("GPS (device), GPS"). Types Linguistic anthropological studies have shown that most human communities have four points of cardinal direction. The names given to these directions are usually derived from either locally-specific geographic features (e.g. "towards the hills", "towards the sea") or from celestial bodies (especially the sun) or from atmospheric features (winds, temperature). Most mobile populations tend to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Compass Rose En 08p
A compass is a device that shows the cardinal directions used for navigation and geographic orientation. It commonly consists of a magnetized needle or other element, such as a compass card or compass rose, which can pivot to align itself with magnetic north. Other methods may be used, including gyroscopes, magnetometers, and GPS receivers. Compasses often show angles in degrees: north corresponds to 0°, and the angles increase clockwise, so east is 90°, south is 180°, and west is 270°. These numbers allow the compass to show azimuths or bearings which are commonly stated in degrees. If local variation between magnetic north and true north is known, then direction of magnetic north also gives direction of true north. Among the Four Great Inventions, the magnetic compass was first invented as a device for divination as early as the Chinese Han dynasty (since c. 206 BC),Li Shu-hua, p. 176 and later adopted for navigation by the Song dynasty Chinese during the 11th century. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Auseklis
Auseklis is a Latvians, Latvian pagan god, a stellar deityLurker, Manfred (2004). ''The Routledge dictionary of gods and goddesses, devils and demons''. Routledge. p. 25. . that represents a celestial body, but possibly not the same as Venus (''Rīta zvaigzne'') - the first "star" (how Latvians call it) to appear in the mornings on the east side of the sky. He is the third most popular deity in Latvian mythology after Saulė and Latvian mythology#Gods and deities, Mēness, but is almost exclusively mentioned in Daina (Latvia), folk songs, as pagan faith gave way to Christianity in Latvia in the 12th century. Name The name ''Auseklis'' stems from the root ''h₂éwsōs, aus-'' ('dawn'), attached to the derivative suffix ''-eklis'', and is etymologically related to other Indo-European deities of the dawn. This deity is also variously known as ''Auseklenis'', ''Ausekliņš'', ''Auseklīts'', ''Auseklītis'', ''Ausekliņis'', ''Auseklius''. Role Auseklis is closely associated ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Star Guñelve
A star is a luminous spheroid of plasma held together by self-gravity. The nearest star to Earth is the Sun. Many other stars are visible to the naked eye at night; their immense distances from Earth make them appear as fixed points of light. The most prominent stars have been categorised into constellations and asterisms, and many of the brightest stars have proper names. Astronomers have assembled star catalogues that identify the known stars and provide standardized stellar designations. The observable universe contains an estimated to stars. Only about 4,000 of these stars are visible to the naked eye—all within the Milky Way galaxy. A star's life begins with the gravitational collapse of a gaseous nebula of material largely comprising hydrogen, helium, and traces of heavier elements. Its total mass mainly determines its evolution and eventual fate. A star shines for most of its active life due to the thermonuclear fusion of hydrogen into helium in its core. Thi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kölner Rudergesellschaft 1891
The Kölner Rudergesellschaft 1891 (abbr. ''Kölner RG 1891'' or just KRG, transl. ''Cologne Rowing Association'' or often ''Koelner RG 1891'' in English media) is a rowing club from the German city of Cologne. Overview It is the second oldest rowing organisation in the Cologne Bay Area and has won 14 medals in the German rowing championships. The club was founded in 1891 by craftsmen from the former working class. In 1898 the club joined the German Rowing Association, and in 1913 it was one of the founding members of the Cologne Regatta Union. It was the first German rowing organisation to allow full membership for non-academic athletes. Overall, the club experienced its most successful racing years in the economic boom of the Golden Twenties celebrating German championships in 1926 and 1927 in various boat categories. Again in 1954, the club reached the first place at the German championships in a coxed four boat. The women's squad of the club celebrated its greatest successes i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
