angular diameter

angular diameter
the angle that the apparent diameter of a celestial object subtends at the eye of the observer.
[1870-75]

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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 …  

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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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