Is Einstein Still Misunderstood?

Abstract

Constancy of the light velocity in different inertial systems and areas of space with different gravity implies that relativistic effects of relative velocity of material change start with massive particles. In Special Theory of Relativity and in General Theory of Relativity time t is a numerical order of material change i.e. motion in a 4D space. Time is not part of the space. Time is a numerical order of change that runs in space.