> > > Perhaps it might be a good idea to first review some more basic stuff:
> > >    https://home.deds.nl/~dvdm/dirk/Physics/Fumbles/LutLog.html
> > > Later on, we can have a closer look at the wonders of equations and
> > > variables and how they conspire to formulate the basics of special
> > > relativity:

Vdm has not the least idea of how to solve the following GR -not a
special relativity- problem:

A light signal of frequency Nu0 is emitted at a distance
aR from the center of a transparent uniform star of mass M and radius R.
What is the GR formula giving the signal frequency Nu1 observed
at the surface of the star, knowing that 0 <= a < R ?

If he could find the solution in a textbook or an article, he would copy it,
claiming that he derived it thanks to his GR expertise. Unhappily for him,
such solution, AFAIK, has not yet been published.

Marcel Luttgens