In astronomy, aberration (also referred to as astronomical aberration, stellar aberration, or velocity aberration) is a phenomenon where celestial objects...

In physics, relativistic aberration is the relativistic version of aberration of light, including relativistic corrections that become significant for...

(optical telescopes). Visible-light astronomy is part of optical astronomy,[clarification needed] and differs from astronomies based on invisible types of light...

from 1742. He is best known for two fundamental discoveries in astronomy, the aberration of light (1725–1728), and the nutation of the Earth's axis (1728–1748)...

cause the apparent position to differ from the mean position: Annual aberration – a deflection caused by the velocity of the Earth's motion around the...

of 8.83″ in 1864. Another method involved determining the constant of aberration. Simon Newcomb gave great weight to this method when deriving his widely...

different configurations to correct for image orientation and types of aberration. Because the image was formed by the bending of light, or refraction,...

parabolic mirrors (primarily a reduction of spherical aberration with elimination of chromatic aberration) led to several proposed designs for reflecting telescopes...

of astronomy is a list of definitions of terms and concepts relevant to astronomy and cosmology, their sub-disciplines, and related fields. Astronomy is...

In astronomy, the geocentric model (also known as geocentrism, often exemplified specifically by the Ptolemaic system) is a superseded description of...

features new sections on generalised coordinate transformations, nutation, aberration, and selenographic coordinates. The fourth edition, coauthored by Jonathan...

In astronomy, an epoch or reference epoch is a moment in time used as a reference point for some time-varying astronomical quantity. It is useful for...

spherical aberration at two wavelengths, rather than one as in an achromat. Telescope objective lenses for wide-band digital imaging in astronomy must have...

The following is a timeline of Solar System astronomy and science. It includes the advances in the knowledge of the Earth at planetary scale, as part...

Duchy of Florence. Galileo has been called the father of observational astronomy, modern-era classical physics, the scientific method, and modern science...

optical fabrication and in retinal imaging systems to reduce optical aberrations. Adaptive optics works by measuring the distortions in a wavefront and...

advantages of using parabolic mirrors—reduction of spherical aberration and no chromatic aberration—led to many proposed designs and several attempts to build...

angle so it can be viewed with an eyepiece. They are free of chromatic aberration found in refracting telescopes. Newtonian telescopes are usually less...

This is a timeline of astronomy. It covers ancient, medieval, Renaissance-era, and finally modern astronomy. Mayan astronomers discover an 18.7-year cycle...

of multiple-element lens for correcting spherical aberration and coma, but not chromatic aberration. His studies on dielectrics led to important results:...

suffered from severe chromatic aberration. Although reflecting telescopes produce other types of optical aberrations, it is a design that allows for...

the aberration. Several types of aberration affect image quality, including spherical aberration, coma, and chromatic aberration. Spherical aberration occurs...

In astronomy, air mass or airmass is a measure of the amount of air along the line of sight when observing a star or other celestial source from below...

dispersion glass may also be used to reduce chromatic aberration. Longitudinal chromatic aberration is a pronounced effect of optical telescope objectives...

The position of Savilian Professor of Astronomy was established at the University of Oxford in 1619. It was founded (at the same time as the Savilian...

in the main mirror. The achromatic lens, which greatly reduced color aberrations in objective lenses and allowed for shorter and more functional telescopes...

trigonometry and the celestial sphere, considering atmospheric refraction and aberration of light, and introducing basic use of a generalised instrument.[citation...

effect for electromagnetic waves such as light is of widespread use in astronomy to measure the speed at which stars and galaxies are approaching or receding...

position due to the effects of light-time correction and aberration is known as planetary aberration. By convention, light-time correction is not applied...

The two surfaces of the reflector have different radii to correct the aberration of the spherical mirror. Light passes through the glass twice, making...