http://www.physicstoday.org/vol-60/iss-1/12_2.html:
"Why no Einstein's laws? Since my undergraduate days, I have been
puzzled by the fact that we have Newton's laws of motion but only
Einstein's theory of special relativity. We have finished celebrating
the 100th anniversary of the publication of the theory of special
relativity, and it seems to me that after a century of validation,
it's time to rename it as more than just a theory. I propose that we,
as physicists, define a set of Einstein's laws, just as we have
Newton's laws, Coulomb's law, or Faraday's law. I begin the discussion
by offering the following three laws: The laws of physics are
identical in all non-accelerating (that is, inertial) frames. The
vacuum speed of light, c, is the same for all inertial frames. The
total energy E of a body of mass m and momentum p is given by E =
[vm2c4 + p2c2]. In particular, the energy of a body measured in its
own rest frame is given by E = mc2, and the energy of a massless body
is E = pc."

Consider again Einstein's Second Law:

Einstein's Second Law (original version): "The vacuum speed of light,
c, is the same for all inertial frames." (In fact, the original 1905
version of Einstein's Second Law was a bit different but this is
irrelevant here.)

This extremely important Law was improved by Einstein himself in the
following way:

Einstein's Second Law (improved): The observer's frame may be inertial
but if the observer and the light source are at different
gravitational potentials, the speed of light is variable and obeys the
equation c'=c(1+V/c^2), where V is the gravitational potential
relative to the light source.

This improved version of Einstein's Second Law was gloriously
confirmed in 1960 when Pound and Rebka measured a gravitational
redshift factor equal to 1+V/c^2. Then clever Einsteinians deduced the
ultimate version of Einstein's Second Law:

Einstein's Second Law (ultimate version): If the relative speed of the
observer and the emitting body is zero, light is always propagated in
empty space with a variable speed c'=c(1+V/c^2) where c is the initial
speed of photons relaive to the emitting body and V is the
gravitational potential relative to the place of emission.
Equivalently, if the observer and the place of emission are at the
same gravitational potential, light is always propagated in empty
space with a variable speed c'=c+v where v is the relative speed of
the observer and the emitting body.

Clever Einsteinians were going to inform the world about the ultimate
version of Einstein's Second Law but suddenly they realised the
ultimate version was incompatible with the original version. The money-
spinner called the theory of relativity was in danger so clever
Einsteinians postponed the publication of the ultimate varsion until
some new money-spinner was devised.

Pentcho Valev