"Jesse Mazer" wrote in message
...


Androcles wrote:

Yes, the best way to think of the problem is an absolute
frame of reference centred on the sun. What do you think
should be the velocity of light in such a frame?
What should it be relative to the vehicle?
Androcles.



When you say "relative to the vehicle", do you mean the speed of a
photon as measured in the vehicle's own rest frame,

Yes.

or do you mean the speed that the distance between the vehicle and a
photon grows, as seen in the sun's rest frame? You understand that
relativity only says the first one has to be equal to c, not the
second one, correct?

Jesse
I understand that Einstein STARTED with
"light is always propagated in empty space with a definite velocity c
which is independent of the state of motion of the emitting body"
and then attempted some invalid mathematics, yes.
I also undertand that he used c+v and c-v in his computation
½[tau(0,0,0,t)+tau(0,0,0,t+x'/(c-v)+x'/(c+v))] = tau(x',0,0,t+x'/(c-v))
and said "But the ray moves relatively to the initial point of k, when
measured in the stationary system, with the velocity c-v, so that
x'/(c-v) = t."

When I went to school, c-v was not equal to c.
It still isn't.
Androcles.