You seem to argue here that Newton and Lorentz proposed un-defined quantities and didn't know what they were talking about. No further comment. (anyway it's all off-topic).[..] The correct distinction is between defined and un-defined conceptions of speed. For example, the "one-way speed of light" can have any value we choose, because it is an undefined concept, whereas the "one-way speed of light in terms of a system of coordinates in which the Newtonian equations of mechanics hold good (to the first approximation)" is unambiguously equal to c. This is objectively true for any pulse of light, whether that particular pulse's speed is measured or not. So the distinction isn't between measured and unmeasured quantities, it's between defined and un-defined quantities. Or, to put it another way, the distinction is between knowing what we are talking about, and not knowing what we are talking about.[..].