To start with how to measure the distance between two points? Are they located in plain surface? A spherical surface? Any other type of surface? Are using a ruler? How you know it is 100% straight not bent any along? How you know it is 100% calibrated? How it was calibrated? What is the accuracy of this calibration?
Quickly, you realize is that the distance between two points is not straight forward as you may have thought. Now, how about two points in space? Simply, assume one point on the moon and one point on the earth. It gets very much greater complicated? What metric you use? Its accuracy? Then it gets more complicated as the element of time become a parameter.
Actually, one gets entangled, trying to define what is a point?
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