unit solid angle
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Solid angle — The solid angle, Ω , is the angle in three dimensional space that an object subtends at a point. It is a measure of how big that object appears to an observer looking from that point. For instance, a small object nearby could subtend the same… … Wikipedia
solid angle — /ˈsɒləd æŋgəl/ (say soluhd angguhl) noun an angle formed by three or more planes intersecting in a common point or at the vertex of a cone; the supplementary SI unit of solid angle is the steradian …
solid angle — noun Date: circa 1704 the three dimensional angular spread at the vertex of a cone measured by the area intercepted by the cone on a unit sphere whose center is the vertex of the cone … New Collegiate Dictionary
Angle — This article is about angles in geometry. For other uses, see Angle (disambiguation). Oblique angle redirects here. For the cinematographic technique, see Dutch angle. ∠, the angle symbol In geometry, an angle is the figure formed by two rays… … Wikipedia
Lambert (unit) — The lambert (symbol L, la or Lb) is a non SI unit of luminance named for Johann Heinrich Lambert (1728–1777), a Swiss mathematician, physicist and astronomer. A related unit of luminance, the foot lambert, is used in the lighting, cinema and… … Wikipedia
Platonic solid — In geometry, a Platonic solid is a convex polyhedron that is regular, in the sense of a regular polygon. Specifically, the faces of a Platonic solid are congruent regular polygons, with the same number of faces meeting at each vertex; thus, all… … Wikipedia
SI derived unit — The International System of Units (SI) specifies a set of seven base units from which all other units of measurement are formed, by products of the powers of base units. These other units are called SI derived units, for example, the SI derived… … Wikipedia
SI supplementary unit — Until 1995, SI ( International System of Units ) supplementary units were:QuantitySymbolName of SI supplementary unitSymbol for SI unitangle θ radianradsolid angle Ω steradiansrAs of October 1995, the category of supplementary units has been… … Wikipedia
Lumen (unit) — The lumen (symbol: lm) is the SI unit of luminous flux, a measure of the perceived power of light. Luminous flux differs from radiant flux, the measure of the total power of light emitted, in that luminous flux is adjusted to reflect the varying… … Wikipedia
particle flux unit — (pfu) a unit used to measure the rate at which energetic particles, such as protons, are received by spacecraft. These flux rates are a major component of the space weather, the environment in which satellites and other spacecraft operate. One … Dictionary of units of measurement
