relative proper motion
Astronomy
noun
The proper motion of a star or other celestial object relative to a set of reference points.
Origin
Late 18th century; earliest use found in William Herschel (1738–1822), musician and astronomer.
| 单词 | relative proper motion |
| 释义 | relative proper motionAstronomy noun The proper motion of a star or other celestial object relative to a set of reference points. Origin |
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