proper motion en · NOUN
Etymology
proper (in the sense of "its own") + motion; from Latin proprius.
Meanings
- The change in apparent position of a celestial body due to that body's velocity relative to the Sun.
Forms
| Spelling | Features | Labels | Source |
|---|---|---|---|
| proper motions | Number=Plur | lexicographic |
Relateds
improper motion · peculiar motion · radial velocity · peculiar velocity