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Seven-pointed Star
A heptagram, septagram, septegram or septogram is a seven-point star polygon, star drawn with seven straight strokes. The name ''heptagram'' combines a numeral prefix, ''hepta-'', with the Greek language, Greek suffix ''wikt:-gram, -gram''. The ''-gram'' suffix derives from ''γραμμῆ'' (''grammē'') meaning a line. Geometry In general, a heptagram is any self-intersecting heptagon (7-sided polygon). There are two ''regular'' heptagrams, labeled as and , with the second number representing the vertex interval step from a regular heptagon, . This is the smallest star polygon that can be drawn in two forms, as irreducible fractions. The two heptagrams are sometimes called the ''heptagram'' (for ) and the ''great heptagram'' (for ). The previous one, the regular hexagram , is a compound of two triangles. The smallest star polygon is the pentagram. The next one is the octagram and its related star figure (a compound of two squares), followed by the regular enneagram ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Star Polygon
In geometry, a star polygon is a type of non-convex polygon. Regular star polygons have been studied in depth; while star polygons in general appear not to have been formally defined, certain notable ones can arise through truncation operations on regular simple and star polygons. Branko Grünbaum identified two primary definitions used by Johannes Kepler, one being the regular star polygons with intersecting edges that don't generate new vertices, and the second being simple isotoxal concave polygons. The first usage is included in polygrams which includes polygons like the pentagram but also compound figures like the hexagram. One definition of a ''star polygon'', used in turtle graphics, is a polygon having 2 or more turns (turning number and density), like in spirolaterals.Abelson, Harold, diSessa, Andera, 1980, ''Turtle Geometry'', MIT Press, p.24 Etymology Star polygon names combine a numeral prefix, such as ''penta-'', with the Greek suffix '' -gram'' (in this cas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
6-simplex T0
In geometry, a 6-simplex is a Duality (mathematics), self-dual Regular polytope, regular 6-polytope. It has 7 vertex (geometry), vertices, 21 Edge (geometry), edges, 35 triangle Face (geometry), faces, 35 Tetrahedron, tetrahedral Cell (mathematics), cells, 21 5-cell 4-faces, and 7 5-simplex 5-faces. Its dihedral angle is cos−1(1/6), or approximately 80.41°. Alternate names It can also be called a heptapeton, or hepta-6-tope, as a 7-facet (geometry), facetted polytope in 6-dimensions. The 5-polytope#A note on generality of terms for n-polytopes and elements, name ''heptapeton'' is derived from ''hepta'' for seven Facet (mathematics), facets in Greek language, Greek and Peta-, ''-peta'' for having five-dimensional facets, and ''-on''. Jonathan Bowers gives a heptapeton the acronym hop. As a configuration This Regular 4-polytope#As configurations, configuration matrix represents the 6-simplex. The rows and columns correspond to vertices, edges, faces, cells, 4-faces and 5-face ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cherokee Indians
The Cherokee (; chr, ᎠᏂᏴᏫᏯᎢ, translit=Aniyvwiyaʔi or Anigiduwagi, or chr, ᏣᎳᎩ, links=no, translit=Tsalagi) are one of the indigenous peoples of the Southeastern Woodlands of the United States. Prior to the 18th century, they were concentrated in their homelands, in towns along river valleys of what is now southwestern North Carolina, southeastern Tennessee, edges of western South Carolina, northern Georgia, and northeastern Alabama. The Cherokee language is part of the Iroquoian language group. In the 19th century, James Mooney, an early American ethnographer, recorded one oral tradition that told of the tribe having migrated south in ancient times from the Great Lakes region, where other Iroquoian peoples have been based. However, anthropologist Thomas R. Whyte, writing in 2007, dated the split among the peoples as occurring earlier. He believes that the origin of the proto-Iroquoian language was likely the Appalachian region, and the split between Norther ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Samarkand
fa, سمرقند , native_name_lang = , settlement_type = City , image_skyline = , image_caption = Clockwise from the top:Registan square, Shah-i-Zinda necropolis, Bibi-Khanym Mosque, view inside Shah-i-Zinda, Sher-Dor Madrasah in Registan, Timur's Mausoleum Gur-e-Amir. , image_alt = , image_flag = , flag_alt = , image_seal = Emblem of Samarkand.svg , seal_alt = , image_shield = , shield_alt = , etymology = , nickname = , motto = , image_map = , map_alt = , map_caption = , pushpin_map = Uzbekistan#West Asia#Asia , pushpin_map_alt = , pushpin_mapsize = 300 , pushpin_map_caption = Location in Uzbekistan , pushpin_label_position = , pushpin_relief = 1 , coordinates = , coor_pinpoint = , co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hokkaido
is Japan's second largest island and comprises the largest and northernmost prefecture, making up its own region. The Tsugaru Strait separates Hokkaidō from Honshu; the two islands are connected by the undersea railway Seikan Tunnel. The largest city on Hokkaidō is its capital, Sapporo, which is also its only ordinance-designated city. Sakhalin lies about 43 kilometers (26 mi) to the north of Hokkaidō, and to the east and northeast are the Kuril Islands, which are administered by Russia, though the four most southerly are claimed by Japan. Hokkaidō was formerly known as ''Ezo'', ''Yezo'', ''Yeso'', or ''Yesso''. Nussbaum, Louis-Frédéric. (2005). "Hokkaidō" in Although there were Japanese settlers who ruled the southern tip of the island since the 16th century, Hokkaido was considered foreign territory that was inhabited by the indigenous people of the island, known as the Ainu people. While geographers such as Mogami Tokunai and Mamiya Rinzō explored the isla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Al-Fatiha
Al-Fatiha (alternatively transliterated Al-Fātiḥa or Al-Fātiḥah; ar, ألْفَاتِحَة, ; ), is the first ''surah'' (chapter) of the Quran. It consists of 7 '' ayah'' (verses) which are a prayer for guidance and mercy. Al-Fatiha is recited in Muslim obligatory and voluntary prayers, known as '' salah''. Quranic chapter titles are not considered by Muslims to be part of the divine revelation of the Quran. The primary literal meaning of the expression "Al-Fatiha" is "The Opener/The Key", which could refer to this Surah being the first in the Quran, the first chapter recited in full in every ''rakat'' of ''salah'', or to the manner in which it serves as an opening for many functions in everyday Islamic life. Some Muslims interpret it as a reference to an implied ability of the Surah to open a person to faith in God. Summary Surah Al-Fatiha is narrated in the Hadith to have been divided into two halves between Allah and His servant (the person reciting), the first t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Occitania
Occitania ( oc, Occitània , , or ) is the historical region in Western Europe, Western and Southern Europe where the Occitan language, Occitan language was historically spoken and where it is sometimes still used as a second language. This cultural area roughly encompasses the southern third of France (with the exception of the French Basque Country and Northern Catalonia, French Catalonia) as well as part of Spain (Aran Valley), Monaco, and smaller parts of Italy (Occitan Valleys, Guardia Piemontese). Occitania has been recognized as a linguistic and cultural concept since the Middle Ages, but has never been a legal nor a political entity under this name. However, the territory was united in Roman times as the ''Septem Provinciae, Seven Provinces'' ( la, Septem Provinciæ) and in the Early Middle Ages (''Aquitanica'' or the Visigothic Kingdom#Kingdom of Toulouse, Visigothic Kingdom of Toulouse, or the share of Louis the Pious following Thionville ''divisio regnorum'' in 806) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Félibrige
The ''Félibrige'' (; in classical Occitan, in Mistralian spelling, ) is a literary and cultural association founded in 1854 by Frédéric Mistral and other Provençal writers to defend and promote the Occitan language (also called the ) and literature. It is presided over by a (classical norm: ). Etymology The word ''félibrige'' is derived from '' félibre'', a Provençal word meaning pupil or follower. Origins Le Félibrige was founded at the Château de Font-Ségugne (located in Châteauneuf-de-Gadagne, Vaucluse) on 21 May 1854 ( Saint Estelle's day), by seven young Provençal poets: Théodore Aubanel, Jean Brunet, Paul Giéra, Anselme Mathieu, Frédéric Mistral, Joseph Roumanille and Alphonse Tavan. Together, they aimed to restore the Provençal language and codify its orthography. Its symbol is a seven-pointed star which, as Frederic Mistral writes in ''Lou tresor dóu Felibrige'', is "a tribute to its seven founders". The movement was launched in Provence but qu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eastern Band Cherokee
The Eastern Band of Cherokee Indians (EBCI), (Cherokee: ᏣᎳᎩᏱ ᏕᏣᏓᏂᎸᎩ, ''Tsalagiyi Detsadanilvgi'') is a federally recognized Indian Tribe based in Western North Carolina in the United States. They are descended from the small group of 800–1000 Cherokee who remained in the Eastern United States after the US military, under the Indian Removal Act, moved the other 15,000 Cherokee to west of the Mississippi River in the late 1830s, to Indian Territory. Those Cherokee remaining in the East were to give up tribal Cherokee citizenship and to assimilate. They became US citizens. The history of the Eastern Band closely follows that of the Qualla Boundary, a land trust made up of an area of their original territory. When they reorganized as a tribe, they had to buy back the land from the US government. The EBCI also own, hold, or maintain additional lands in the vicinity, and as far away as from the Qualla Boundary. The Eastern Band of Cherokee Indians are primarily ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Georgian Air Force
The Aviation and Air Defence Command of the Defense Forces of Georgia, Defence Forces ( ka, თავდაცვის ძალების ავიაციისა და საჰაერო თავდაცვის სარდლობა, tr), (''formerly'' Georgian Air Force (, ''sak’art’velos sahaero dzalebi'')) is the air force of the Defense Forces of Georgia. It was established as part of the Georgian Armed Forces in 1992 and merged into Army Air Section in 2010. As part of reforms in the Georgian military, the Air Force was reestablished as a separate command of the Defense Forces in 2016. History Founding and abolition The Georgian Air Force and Air Defense Division was established on January 1, 1992. On August 18, 1998, the two divisions were unified in a joint command structure and renamed the Georgian Air Force. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Antiprism 7-4
In geometry, an antiprism or is a polyhedron composed of two parallel direct copies (not mirror images) of an polygon, connected by an alternating band of triangles. They are represented by the Conway notation . Antiprisms are a subclass of prismatoids, and are a (degenerate) type of snub polyhedron. Antiprisms are similar to prisms, except that the bases are twisted relatively to each other, and that the side faces (connecting the bases) are triangles, rather than quadrilaterals. The dual polyhedron of an -gonal antiprism is an -gonal trapezohedron. History At the intersection of modern-day graph theory and coding theory, the triangulation of a set of points have interested mathematicians since Isaac Newton, who fruitlessly sought a mathematical proof of the kissing number problem in 1694. The existence of antiprisms was discussed, and their name was coined by Johannes Kepler, though it is possible that they were previously known to Archimedes, as they satisfy the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
