What is the physical coordinate system, how do we determine a motion in physics if General relativity space-time continuum is not directly measured? What is the GR space-time continuum, is it matter or something like electromagnetic field? Is it philosophy notion? What is the precise physical determination of GR space-time continuum notion?
Are the usual physics textbook propositions "the physical line is the trajectory of light ray", "the point where the material point (it has a mass) is located has all three dimensions which are neglected in the particular task" still TRUE, MEANINGFUL?
Abstractions of point, line, and plane are approximated in physics when useful, but are strictly not physical objects.
So the foundations of physics are not so strong :). Einstein invented general relativity space-time continuum but is it measured ? Time dilation of satellites is measured but what is about length change?
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