Final answer:
The description of position in physics depends on a reference point.
Step-by-step explanation:
In physics, a description of position depends on a reference point.
To describe the motion of an object, you must first be able to describe its position where it is at any particular time. More precisely, you need to specify its position relative to a convenient reference frame.
Earth is often used as a reference frame, and we often describe the position of an object as it relates to stationary objects in that reference frame.