| 单词 | relative proper motion |
| 释义 | Definition of relative proper motion in English:relative proper motionnoun Astronomy
OriginLate 18th century; earliest use found in William Herschel (1738–1822), musician and astronomer. Definition of relative proper motion in US English:relative proper motionnoun Astronomy
OriginLate 18th century; earliest use found in William Herschel (1738–1822), musician and astronomer. |
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