oa Explorations on the Earth's relativistic gravity field

According to Newtonian theory, space and time are absolute, and consequently, once a length measure standard and a time measure standard are chosen, they keep invariant. According to relativity however, the length and time measure standards may vary with different positions and different reference systems. This implies that the observed values at points A and B are not absolute. Hence, we must establish a "common measure standard system", into which all observed values must be transformed.