Try to define Reference System (RS). place the cursor on the words and you will see a valid definition.

Fourth year of secondary education
Trajectory and displacement
I. Sevila
  T. & D.  
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2. REFERENCE SYSTEM

In the following simulation we are going to present two moving objects


The "eye" has observed the movement of the red spot from different places. What if, from now on, instead of the word "eye" we refer to it as a Reference system (RS)?.

The most distant stars in the firmament are often used as reference systems at rest (absolute) as their movement is imperceptible from the earth.
Introduction to the study of movement
Reference system
Trajectory
Displacement
EVALUATION