angular diameter

angular diameter
the angle that the apparent diameter of a celestial object subtends at the eye of the observer.

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Universalium. 2010.

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  • 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

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  • 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

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  • 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

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