What is parallax?
A) the distance to an object, measured in parsecs
B) the angle taken up by the size (e.g., diameter) of an object, as seen by an observer
C) the shift in angular position of an object as it moves in space
D) the apparent shift in position of an object as the observer moves

Question

Quizplus · Accepted Answer

Parallax is the apparent shift in position of an object as the observer moves. This is because the observer's perspective changes, causing the object to appear to move relative to the background. This effect is often used in astronomy to measure the distances to stars and other objects in space.

What Is Parallax