[Dominick]

I know about the measurement problems, I never considered for a second that someone would be able to claim the measurement was accurate but the speed of light actually changed! Is this the position?

[general_re]

I never considered for a second that someone would be able to claim the measurement was accurate but the speed of light actually changed! Is this the position?

PMFJI, but if I may, the position that the speed of light is not constant during evolutionary timescales is held by (some of) those who have a vested interest in proving the universe to be a recent development, to put it euphemistically - e.g., Barry Setterfield and few others who have grasped hold of his theories. It should be noted, however, that this is definitely not the position of mainstream physicists. In fact, the argument that a slowing speed of light supports a young universe has been rejected by many creationists as well, chiefly the Institute for Creation Research (ICR).

[redgolum]

Don't know if someone else has this covered, but the speed of light has been theorized not to be constant for quite a while. I think the current trend is that it is slowing down, but we are talking small variations in an enormous speed. I will try to google it, but I seem to remember Discover magazine had something on this recently.