zonal aberration - significado y definición. Qué es zonal aberration
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Qué (quién) es zonal aberration - definición

CHESS TOURNAMENTS ORGANIZED BY FIDE FROM THE 1950S TO THE 1990S
Zonal Tournament; Zonal (chess)

Optical aberration         
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  • Reflection from a spherical mirror. Incident rays (red) away from the center of the mirror produce reflected rays (green) that miss the focal point, F. This is due to [[spherical aberration]].
  • Fig. 3a: Barrel distortion
  • Fig. 3b: Pincushion distortion
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  • Image plane of a flat-top beam under the effect of the first 21 Zernike polynomials. The beam goes through an aperture of the same size, which is imaged onto this plane by an ideal lens.
DEPARTURE OF THE PERFORMANCE OF AN OPTICAL SYSTEM FROM THE PREDICTIONS OF PARAXIAL OPTICS
Optical abberation; Actinic Rays; Aberration, optical; Lens aberrations; Lens Aberrations; Optical aberrations; Optical Aberrations; Lens aberration; Aberration (optics); Aberration in optical systems; Seidel aberration; Seidel aberrations; Optical abberration; Curvature of image; Curvature of field; Monochromatic aberration

In optics, aberration is a property of optical systems, such as lenses, that causes light to be spread out over some region of space rather than focused to a point. Aberrations cause the image formed by a lens to be blurred or distorted, with the nature of the distortion depending on the type of aberration. Aberration can be defined as a departure of the performance of an optical system from the predictions of paraxial optics. In an imaging system, it occurs when light from one point of an object does not converge into (or does not diverge from) a single point after transmission through the system. Aberrations occur because the simple paraxial theory is not a completely accurate model of the effect of an optical system on light, rather than due to flaws in the optical elements.

An image-forming optical system with aberration will produce an image which is not sharp. Makers of optical instruments need to correct optical systems to compensate for aberration.

Aberration can be analyzed with the techniques of geometrical optics. The articles on reflection, refraction and caustics discuss the general features of reflected and refracted rays.

Aberration (astronomy)         
  • Stars at the [[ecliptic pole]]s appear to move in circles, stars exactly in the ecliptic plane move in lines, and stars at intermediate angles move in ellipses. Shown here are the apparent motions of stars with the [[ecliptic latitude]]s corresponding to these cases, and with [[ecliptic longitude]] of 270°.
  • γ Draconis]] and [[35 Camelopardalis]] as reduced by Busch to the year 1730.
  • Hypothetical observation of γ Draconis and 35 Camelopardalis if their movements were caused by nutation.
  • Hypothetical observation of γ Draconis if its movement was caused by parallax.
  • Figure 2: As light propagates down the telescope, the telescope moves requiring a tilt to the telescope that depends on the speed of light. The apparent angle of the star ''φ'' differs from its true angle ''θ''.
  • Young reasoned that aberration could only be explained if the aether were immobile in the frame of the Sun. On the left, stellar aberration occurs if an immobile aether is assumed, showing that the telescope must be tilted. On the right, the aberration disappears if the aether moves with the telescope, and the telescope does not need to be tilted.
  • Conceptual illustration of Stokes' aether drag theory. In the rest frame of the Sun the Earth moves to the right through the aether, in which it induces a local current. A ray of light (in red) coming from the vertical becomes dragged and tilted due to the flow of aether.
  • The propagating wavefront moving through the aether.
  • Light rays striking the earth in the Sun's rest frame compared to the same rays in the Earth's rest frame according to special relativity. The effect is exaggerated for illustrative purposes.
PHENOMENON IN ASTRONOMY
Astronomical aberration; Stellar aberration; Constant of aberration; Aberration of starlight; Stellar Aberration; Planetary Aberration; Planetary aberration; Annual aberration; Aberration of light (non-dependence of star's velocity); Abberation of light; Aberration of light
In astronomy, aberration (also referred to as astronomical aberration, stellar aberration, or velocity aberration) is a phenomenon which produces an apparent motion of celestial objects about their true positions, dependent on the velocity of the observer. It causes objects to appear to be displaced towards the direction of motion of the observer compared to when the observer is stationary.
2017–18 Zonal T20 League         
CRICKET TOURNAMENT
2017-18 Zonal T20 League
2017–18 Zonal T20 League was a Twenty20 cricket competition in India. It was played from 7 to 16 January 2018.

Wikipedia

Interzonal

Interzonal chess tournaments were tournaments organized by the World Chess Federation FIDE from the 1950s to the 1990s. They were a stage in the triennial World Chess Championship cycle and were held after the Zonal tournaments, and before the Candidates Tournament. Since 2005, the Chess World Cup has filled a similar role.