In his theory of General Relativity, Einstein replaced the Lorentz transformation by the Minkowski formula. He also introduced the variable speed of light in gravitation. This is unnecessary and untenable: it is in conflict with Noether’s theorem on energy and momentum conservation.
The authors use the ‘time’ as Karl Schwarzschild defined it (measured from infinity). Then, by also using the Shapiro Solution, they repair the Schwarzschild Solution.
The new Solution is simpler and more elegant, is united with Special Relativity again and adheres to Noether’s theorem. More important, it describes exactly what we measure. This repaired solution excludes black hole singularities, explains the Shapiro delay and predicts the core temperature of the sun.