planetary aberration

planetary aberration (plural planetary aberrations)

1. (astronomy) A deviation of where a planet appears to be, due to the motion of the planet during the time that the light reaches the Earth.

• Lesley Brown, editor-in-chief, William R. Trumble and Angus Stevenson, editors (2002), “planetary aberration”, in The Shorter Oxford English Dictionary on Historical Principles, 5th edition, Oxford, New York, N.Y.: Oxford University Press, →ISBN, page 7.