There is ONLY ONE FUNDAMENTAL CORRECTNESS in Einstein's relativity:
Einstein's principle of constancy of the speed of light:

http://www.fourmilab.ch/etexts/einstein/specrel/www/"...light is
always propagated in empty space with a definite velocity c which is
independent of the state of motion of the emitting body ".

All bodies are 4 dimensional.

Bodies spin.

If a body is to release a photon, then it will do so with the result
being the photon traveling across empty space at the velocity of c.

When a body is in motion across space, it is being rotated within
Space-Time. The faster it moves across space, the more it extends
across Time, and the less it extends across Space. This gives the
appearance of there being a spatial length contraction.

Also during such an event, the axis of a spinning body also begins to
extend more across Time, and less across Space, for it too is being
rotated across Space-Time. This then effects the velocity of a photon
released from such a spinning body. The change of the photons spatial
velocity is proportional to the spatial velocity of the moving body.

Ex. in the forward direction, the photons velocity becomes c - v. This
is then combined with the velocity of the moving body that released
that photon.

( c - v [photon] ) + ( v [moving body] ) = c.

Therefore, no matter what the velocity is of a moving body, it will
still release a photon in such a manner that the photon will be in
motion at a c velocity relative to an open space.

http://www.outersecrets.com/real/forum_againstum2.htm