An apparent change of place, or alteration of their mean position, in the fixed stars, caused by the earth's orbital movement.
♦ Aberration of a planet signifies its progressive geocentric motion, or the space through which it appears to move, as seen from the earth, during the time which light occupies in passing from the planet to us.
♦ Crown of aberration is a spurious circle surrounding the proper disc of the sun.
♦ Constant of aberration, or amount of displacement in the sun's longitude, arising from the progressive motion of light, is established at 20″·45.