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“proper”
proper fraction
A fraction in which the numerator is smaller than the denominator.
This entry is located in the following unit:
Measurements and Mathematics Terms
(page 8)
proper motion
The movement of a star in the celestial sphere which is more noticeable in near stars than in distant stars; in practice, the movement of the latter is negligible.
This entry is located in the following unit:
Astronomy and related astronomical terms
(page 20)