In astronomy, it is the angular displacement, caused by the  earth's orbital motion, of the apparent path of light from a star.  
In astronomy, it is the angular displacement, caused by the  earth's orbital motion, of the apparent path of light from a star.  The spherical type of this phenomenon is caused by the failure of  light rays to meet at a single point when reflected by a concave  mirror, while the chromatic type is caused by the fact that violet  light is refracted more than red light. FTP, name this optical  effect that leads to fuzzy images or blurred coloring by the edges.
In astronomy, it is the angular displacement, caused by the  earth's orbital motion, of the apparent path of light from a star.  
{aberration}