aberration of starlight
A Dictionary of Astronomy
aberration of starlight The small apparent difference between the observed direction of a star and its true direction (see diagram). It is due to the combined effect of the observer's motion across the path of incoming starlight and the finite velocity of light. The actual amount of displacement and its direction depend on the observer's speed and direction of motion. Aberration of starlight resulting from the Earth's orbital motion is termed
annual aberration; the much smaller effect resulting from the Earth's rotation is
diurnal aberration.
Planetary aberration is a combined result of the observer's motion and the time taken for light to travel from a body in the Solar System to the observer.
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© A Dictionary of Astronomy 1997, originally published by Oxford University Press 1997.
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