What is proper motion?
A)It is the true, not apparent, motion of a star in space.
B)It is the apparent shift as we go to opposite sides of our orbit every six months.
C)It is the annual apparent motion of a star across the sky.
D)It is the motion of a star towards or away from us, revealed by Doppler shifts.
E)It is the orbital motion of a star around the Galaxy.

Question

Quizplus · Accepted Answer

Proper motion is the annual apparent motion of a star across the sky, as observed from Earth, due to its actual movement through space relative to the solar system.

What Is Proper Motion