Why Do the Precise Astronomical Coordinates of Right Ascension and Declination

Why do the precise astronomical coordinates of right ascension and declination of a star change systematically night by night?

A) because of precession of Earth's spin axis
B) because of the bending of light by Earth's atmosphere
C) They do not change because they are fixed positions on a star chart.
D) because of the motion of Earth in its orbit around the Sun

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