Annual aberration is caused by the motion of an observer on the Earth revolving around the Sun.
2.
In the case of annual aberration of starlight, the direction of incoming starlight as seen in the Earth's moving frame is tilted relative to the angle observed in the Sun's frame.
3.
In practice, because the Earth is not an inertial rest frame but experiences centripetal acceleration towards the Sun, many aberrational effects such as annual aberration on Earth cannot be considered light-time corrections.
4.
Assuming a circular orbit, annual aberration causes stars exactly on the ecliptic ( the plane of the Earth's orbit ) to appear to move back and forth along a straight line, varying by \ kappa on either side of their position in the Sun's frame.
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