Nimleth

Hi xytz, Thanks for the tip about relativistic aberration, this was very helpful. So, if I understand it correctly, the photons do actually take on the velocity components of the source. I hadn't seen any explicit reference to this before. So the fact that the source still sees the light having the velocity c comes purely from the variability in time. Thanks a million, Dennis

Yes I know this. But I'm not talking about measuring the speed of light. I'm talking about measuring the direction of the light. Or rather, the change in direction. Maybe I haven't been clear. Basically what I'm saying is that not only the speed of light is constant but also the direction is fixed.

Hi, I've read on several forums and websites there there is no such thing as absolute speed or movement, it's always relative because there is no fixed frame of reference. But, if the speed of light is constant and thus independent of the speed/movement of it's source, than this must mean that the direction or vector of a light beam is also constant once it is generated. If the vector (x,y,x) of a light beam is not influenced by the movement/speed of its source (lets say a laser diode) than a light beam in it self is a fixed frame of reference. So this would mean that if I can somehow capture a light beam and measure the (apparent) change in its direction, I can measure my own absolute movement. Any thoughts on why this is not correct? (Because, as far as I know, according to modern science this is not true). Thanks, Dennis