Newton’s Bucket demonstrates that there is no way of ultimately measuring how an object is moving and at what speed and direction. If one looks at the way the object is moving from different perspectives then it appears to be different. Also when there are frames of reference it makes it even more difficult to tell the direction or speed of the object. One can’t be sure that one object is moving over another when it is just the two of them in a space. And if there is nothing else in space but one object there is no way of telling if it is moving or staying still, because there is nothing to base its movement (or lack of) on. Therefore, there can’t be an ultimate frame of reference, because everything depends on everything else to decipher if it is moving or not. Some people say that the universe is the ultimate frame of reference but, that could be moving too, so there is no way to tell. In my point of view, people can measure speed, direction, acceleration, velocity, etc. with equations but they are only correct if the frame of reference is stated, because without that no one can tell if the answer is based of a moving or still object, or even close or far object. Even if the frame of reference is the universe, there is no way of telling that it is correct, because the earth is rotating, the answer found be close but not exact, but then again nothing is exact so its all good!