I've been looking into the history of the speed of light values and when the last accepted value was set at. This value we use today was set in 1983. In interest of the Cern experiment and the technology advances today compared to technology that is over 30 years old, Has anyone used todays advanced equipment with lower degrees of error to recalculate/comfirm the speed of light? After all there is a significant difference in the processing power of our electronics etc, seems to me this value may need to be looked at. The Cern experiment is 8km/s higher than the accepted speed of light. and NO this post is not to be used to discuss the CERN experiment other than the reason for my post so do not consider as such . I was surprised at the age of the last update on the value for c, It would place my mind at rest knowing if there have been more recent confirmation tests of that value using equipment with higher precision.