Alternate Definitions for Proper motions

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Term: Proper motions
Definition:

The apparent motion of a star across the sky (not including a star's parallax), arising from the star's velocity through space with respect to the Sun. Proper motion is usually tabulated in star catalogs as changes in right ascension and declination per year or century.

Created 2023.04.16
Last Modified 2023.04.16
Contributed by Ryan McGranaghan
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