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I would disagree with some of that. For example, gravity causes acceleration relative to the center of mass of some object. While the units of speed and acceleration of an object are arbitrary, the gravitational center of each object can be tracked and the object can be seen to be moving (eg Jupiter around the Sun).
Temperature can be defined as the average kinetic energy of the particles in a given medium; it can be described beyone 'hot' and 'cold'.
While one could argue that we don't know for sure where Jupiter and the sun are, and that we only think we see the light coming from them, I'm pretty sure both of them are there, and that the theory of gravity is pretty much correct.
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