WordReference Random House Unabridged Dictionary of American English © 2025
parallac′tic ellipse′, [Astron.]
  1. Astronomythe 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. parallax (def. 2).

'parallactic ellipse' also found in these entries (note: many are not synonyms or translations):
parallax

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