269suppose you are in the solar system..,and then when you look at the sun and the earth..you will see that the earth is revolving around the sun. This was 1 point of reference.
now lets change it.
suppose now u are sitting on the earth.everyday you see that the earth moves from earth to west, in a semicircle, appearing that it somewhat revolves around the earth.
so, whether an object is moving or not...or which object is actually moving, it depends upon the frame of reference.
the most common example is the train one.