Meaning of parallactic ellipse

parallac'tic ellipse'

Pronunciation: [key]
— Astron. Astron.
  1. the apparent ellipse, as seen against the background of more distant stars, described annually by a nearby star because of the earth's orbital motion around the sun. Cf.(def. 2).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.