Astrometry
the branch of astronomy that deals with the measurement of the positions and motions of the celestial bodies.
Historical Examples
The subject of Astrophysics does not admit of so definite a subdivision as that of astrometry.
Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 7 Various
noun
the branch of astronomy concerned with the measurement of the position and motion of celestial bodies
astrometry
(ə-strŏm’ĭ-trē)
The scientific measurement of the positions and motions of celestial bodies.
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