Respuesta :
A system employing co-ordinates, where the point is located, is chosen to represent its spacing from parallel lines intersecting at a spot called the source, and the further discussion can be defined as follows:
- It is a frame of reference, that often called a physical reference frame, a frame of reference, or simply a framework.
- It is a physical concept connected with the writer's movement.
- The observatory frame has two types: inertial as well as non-inertial.
Therefore, the final answer is "It is used as a frame of reference".
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