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Meaning of proper motion | Babel Free

Noun CEFR B2

Definitions

The change in apparent position of a celestial body due to that body's velocity relative to the Sun.

CEFR level

B2

Upper Intermediate
This word is part of the CEFR B2 vocabulary — upper intermediate level.

See also

proper name Proper Nangalisan proper noun proper nounhood Proper Puguis proper right