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parallactic motion
noun
, Astronomy.
- the apparent motion of stars due to the earth's orbital motion.
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Word History and Origins
Origin of parallactic motion1
First recorded in 1885–90
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Example Sentences
By parallactic motion is meant the apparent displacement in consequence of the solar motion which is now known with great accuracy, and amounts to 19.5 kilometers per second.
From Project Gutenberg
If we ascertain the parallactic motion of a group of stars, then we can find their average distance.
From Project Gutenberg
From the parallactic motion of the star it is possible to deduce its distance from the sun, or its parallax.
From Project Gutenberg
In both cases the motion may be either a reflex of the motion of the observer, and is then called parallactic motion, or it may be caused by a real motion of the star.
From Project Gutenberg
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