the apparent motion of stars due to the earth's orbital motion.
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How to use parallactic motion in a sentence
The most obvious and direct method is to determine the parallactic motion of the stars of known parallax.
From the parallactic motion of the star it is possible to deduce its distance from the sun, or its parallax.Lectures on Stellar Statistics | Carl Vilhelm Ludvig Charlier
If we ascertain the parallactic motion of a group of stars, then we can find their average distance.Astronomy | David Todd