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date: 07 April 2020

aberration of starlight 

A Dictionary of Astronomy
Ian RidpathIan Ridpath

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 ... ...

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