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2017 Word of the Year

parallactic ellipse

noun, Astronomy.
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.
Compare parallax (def 2).
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for parallactic ellipse
Historical Examples
  • If a penny-piece were placed on this sphere, in front of each of the stars, every parallactic ellipse would be totally concealed.

    The Story of the Heavens Robert Stawell Ball

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