My language was not exact in scientific terms, but what I was saying is that Einstein was talking about the relativity of time and using the speed of light to demonstrate his point, since light speed is the fastest anything can go according to known physics. Relativistic effects are minimal unless you are looking at, for example, the environment around a black hole.



You mean like claiming to draw inferences from texts concerning reference molluscs and Gaussian four-dimensional co-ordinate systems? Or are you saying you do understand those things?

You are evading the question.

Please explain how time being relative means that the speed of light cannot be measured.