aberration, constant of

A Dictionary of Astronomy

aberration, constant of See Annual Aberration.
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© A Dictionary of Astronomy 1997, originally published by Oxford University Press 1997.

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Related entries from encyclopedias, dictionaries, and thesauruses

constant of aberration
constant of aberration See annual aberration . Read more
annual aberration
annual aberration The small displacement in position of a star's image...due to the motion of the Earth around the Sun. Annual aberration was discovered by J. Bradley in 1728 from observations...Earth's mean velocity to the speed of light gives the constant of aberration , 20”.5. This is the ... Read more
aberration of starlight
aberration of starlight displacement of the apparent path of light from a star, resulting in a displacement...ellipses have the same semimajor axis, 20.5′′ of arc, a value known as the constant of aberration. The tangent of the constant of aberration is equal to the ratio of the ... Read more
James Bradley
...meticulous astronomers, discovered the aberration of light and the nutation of the...moved in an ellipse, which created an aberration of light. This was a very remarkable...precisely the modern value for the constant of aberration, about 20.5 seconds (the modern value...20.47 seconds). Out of his ... Read more
Struve, FriedrichGeorgWilhelm von
...the Pulkovo Observatory, near St Petersburg. He made the third reliable measurement of a stellar parallax, that of Vega, in 1840. He also refined values for astronomical constants, including the constant of aberration (see annual aberration ). Read more

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