I know, but many times the physical meaning of something is lost while making it easier to be calculated mathematically.
This is what happens in this case, to me. I can't see through the equations.
You know what I mean? There are many who understand the equations of Einstein's theory of Relativity, but not so many who actually understand that theory.
CliveL, thank you. Probably Stanford notes are too much for a humble pilot like me. But I will take a look at it anyway
cheers