Calculating the direction of the "center" of the universe? I've had a theory lingering in my consciousness for a long time. I've wondered about the relevance between the speed of light, red-shift in stars and galaxies and relativity. Although c is a constant, I have read somewhere that this constant has actually changed over time. I read it in one of those popular science magazines though so I'm not really sure what to make of it. Anyway. Shouldn't it be theoretically possible to calculate the direction of the center of the universe using the speed of light? The experiment would probably have to be done in space with a gigantic rig, but there's got to be some way to minimize the experiment. Basically, the rig would need to travel in one direction while shooting a beam of light in the same direction. This would be done in all directions. I don't know how we would measure the actual speed of those beams (maybe the technology is impossible or does not exist yet) but since the rig is moving in the direction that the beam of light is shot there should be a difference in the velocity when shooting in separate directions. I find it really hard to explain in words since I studied astronomy in Icelandic. Basically, imagine someone on a pickup truck kicking the ball off in separate directions while the truck is driving, depending on the relative vectors, the difference in the velocity of the truck and the ball will differ. Am I making any sense or am I confusing things and breaking the laws of physics?