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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

the branch of astronomy concerned with the measurement of the position and motion of celestial bodies
The scientific measurement of the positions and motions of celestial bodies.


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