Why Do the Precise Astronomical Coordinates of Right Ascension and Declination

question 175

Multiple Choice

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