Answer:
the answer is D
Explanation:
The astromerty instrument
The astrometry instrument of GAIA is used to determine the angular positions of stars to better measure their distances and motions.
GAIA stands for Global Astrometric Interferometer For Astrophysics. The spacecraft is designed for astrometry: measuring the positions, distances and motions of stars with unprecedented precision.
Angular position represents the orientation of a line with another line or plane. Angular position is quantified by measuring how far the body is rotated from the reference position.
By combining the measurements of any given star over the five-year mission, it will be possible to determine its distance and its proper motion.
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