  General Relativity is considered to be so far the best gravitation theory.
However it is quite hard to use in real situations. The root of these
difficulties lays in the non-linearity of the theory. Our aim was not to
linearize the theory, but find the source of non-linearity and get rid of it.
We found that the resolution can be obtained by defining standards and units
properly. We also found that the mathematical method to change the units of
General Relativity has been discussed in general almost 40 years ago by Dicke.
Linear Relativity can be founded by choosing the right function for his
transformation and reinterpret his results.
