angular diameter

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• Angular diameter — The angular diameter or apparent size of an object as seen from a given position is the “visual diameter” of the object measured as an angle. In the vision sciences it is called the visual angle. The visual diameter is the diameter of the… …   Wikipedia

• angular diameter — kampinis skersmuo statusas T sritis fizika atitikmenys: angl. angular diameter; apparent diameter vok. scheinbare Durchmesser, m; Winkeldurchmesser, m rus. видимый диаметр, m; угловой диаметр, m pranc. diamètre angulaire, m; diamètre apparent, m …   Fizikos terminų žodynas

• Angular diameter distance — The angular diameter distance is a distance measure used in astronomy. The angular diameter distance to an object is defined in terms of the object s actual size, x, and heta the angular size of the object as viewed from earth. d A= frac{x}{… …   Wikipedia

• angular diameter — Astron. the angle that the apparent diameter of a celestial object subtends at the eye of the observer. [1870 75] * * * …   Universalium

• angular diameter — /ˌæŋgjələ daɪˈæmətə/ (say .anggyuhluh duy amuhtuh) noun the angle which the apparent diameter of a celestial body subtends at the observer s eye …  

• angular diameter — Astron. the angle that the apparent diameter of a celestial object subtends at the eye of the observer. [1870 75] …   Useful english dictionary

• Angular resolution — describes the resolving power of any image forming device such as an optical or radio telescope, a microscope, a camera, or an eye. Definition of terms Resolving power is the ability of the components of an imaging device to measure the angular… …   Wikipedia

• Angular size redshift relation — The angular size redshift relation describes the relation between the angular size observed on the sky of an object of given physical size, and the objects redshift from Earth (which is related to its distance, d , from Earth). In a Euclidean… …   Wikipedia

• Diameter — For the notion of diameter in graph theory, see Distance (graph theory). For the computer network protocol, see Diameter (protocol). Diameter In geometry, a diameter of a circle is any straight line segment that passes through the center of the… …   Wikipedia

• angular aperture — n the angle subtended at the principal focus of an optical system (as a microscope) by the diameter of its entrance for light …   Medical dictionary

• Angular aperture — The angular aperture of a lens is the apparent angle of the lens aperture as seen from the focal point::a = 2 arctan left( frac {D/2} {f} ight)where :f is the focal length:D is the diameter of the aperture. Relation to numerical aperture In a… …   Wikipedia