> Biting the dust again ah David? Why do you not take a break and study
> at least a little of physics?
> 
> http://farside.ph.utexas.edu/teaching/em/lectures/node108.html
> 
> "Consider, now, a wave-like disturbance which is self-regenerating,
> and does not require a medium through which to propagate. The most
> well-known example of such a disturbance is a light wave. Another
> example is a gravity wave. According to electromagnetic theory, the
> speed of propagation of a light wave through a vacuum is
> c = 1/sqrt(epsilon_0*mu_0)=2.99729*10^8 meters per second (1323)
> where epsilon_0 and mu_0 are physical constants which can be evaluated
> by performing two simple experiments which involve measuring the force
> of attraction between two fixed changes and two fixed parallel current
> carrying wires. According to the relativity principle, these
> experiments must yield the same values for epsilon_0 and mu_0 in all
> inertial frames...

And right now, E0 and M0 are defined quantities.  And they are defined
for free space.  Why do you think there are ZERO subscripts there?
These are not about Eric's degrees.  This is because epsilon and mu
take on different values in different inertial frames.  Of course,
Einstein assumed one would measure the same value, but who has
measured such values?  Again it boils down to an assumption that
Einstein makes.  The constancy of E0 and M0 in ALL inertial frames is
not a direct consequence of Maxwell's equations.  Try to use that
brain, if you can.