Parallax is the apparent difference in the position of a nearer object, compared to more distant background objects, when viewed from two different positions.
It is important to discuss two locations to describe the position of an object. The two locations helps us to best discuss the object.
The location of an object is its position.
The change in position of an object compared to a reference point(another object) is called motion.
It is called "displacement" - the net change in distance and position.
Displacement.
Displacement is the overall change in position
Velocity
Potential Energy- is the energy inside an object because of the position
It is called parallax and is often used for calculating the distance to stars and other distant objects which can't be measured directly.
potential energy
movement
Displacement or parallax.