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1Golden ratio — For the Ace of Base album, see The Golden Ratio (album). Not to be confused with Golden number. The golden section is a line segment divided according to the golden ratio: The total length a + b is to the length of the longer segment a as the… …
2Circulation (journal) — Circulation   Discipline Cardiology, cardiovascular medicine …
3Pentagram — For other uses, see Pentagram (disambiguation). Regular pentagram A pentagram Type Star polygon Edges and vertices 5 Schläfli symbol {5/2} …
4Sundial — A sundial is a device that measures time by the position of the Sun. In common designs such as the horizontal sundial, the sun casts a shadow from its style (a thin rod or a sharp, straight edge) onto a flat surface marked with lines indicating… …
5Mathematical morphology — A shape (in blue) and its morphological dilation (in green) and erosion (in yellow) by a diamond shape structuring element. Mathematical morphology (MM) is a theory and technique for the analysis and processing of geometrical structures, based on …
6Ptolemy's theorem — In mathematics, Ptolemy s theorem is a relation in Euclidean geometry between the four sides and two diagonals or chords of a cyclic quadrilateral. The theorem is named after the Greek astronomer and mathematician Ptolemy (Claudius Ptolemaeus).If …
7Film speed — is the measure of a photographic film s sensitivity to light, determined by sensitometry and measured on various numerical scales, the most recent being the ISO system. A closely related ISO system is used to measure the sensitivity of digital… …
8Gall-Peters projection — The Gall Peters projection is one specialization of a configurable equal area map projection known as the equal area cylindric or cylindric equal area projection. The Gall Peters achieved considerable notoriety in the late 20th century as the… …
9Isometric projection — is a form of graphical projection more specifically, an axonometric projection. It is a method of visually representing three dimensional objects in two dimensions, in which the three coordinate axes appear equally foreshortened and the angles… …
10Troubadour — A troubadour (IPA: IPA| [tɾuβaˈðuɾ] , originally IPA| [tɾuβaˈðoɾ] ) was a composer and performer of Occitan lyric poetry during the High Middle Ages (1100 ndash;1350). The troubadour school or tradition began in the eleventh century in Occitania …
