For a more academic treatment: “The crucial problem of how to synchronize clocks and measure the one-way speed of light was originally discussed by Poincaré and Einstein. After being neglected for many decades, the Poincaré-Einstein problem of synchronization revived in 1977 with the work of Mansouri and Sexl, by which the one-way speed remains undetermined, allowing for unequal values of the speed of light in opposite directions.” <https://link.springer.com/article/10.1140/epjd/e2012-20524-8> [10053.png] On measuring the one-way speed of light - The European Physical Journal D<https://link.springer.com/article/10.1140/epjd/e2012-20524-8> link.springer.com<https://link.springer.com/article/10.1140/epjd/e2012-20524-8> So it’s completely reasonable to assume the speed of light is 1/2 c in one direction and infinite in the other. It’s just an optional convention that we consider the speed to be the same in both directions. Einstein said that light’s one-way speed “is in reality neither a supposition nor a hypothesis about the physical nature of light, but a stipulation which I can make of my own freewill in order to arrive at a definition of simultaneity.”* *A. Einstein, Relativity: The Special and General Theory, authorized translation by R. W. Lawson (New York: Crown Publishers, 1961), p 23. Perhaps an RFC should be written to address this :) -mel On Jul 21, 2024, at 6:38 PM, Scott Q. <qmail@top-consulting.net> wrote: Well...it gets complicated :) https://www.youtube.com/watch?v=pTn6Ewhb27k On Sunday, 21/07/2024 at 20:15 Josh Luthman wrote: Whoops, that should have said radio waves travel faster than fiber (more so in a vacuum). On Sun, Jul 21, 2024 at 8:07 PM Chris Adams <cma@cmadams.net<mailto:cma@cmadams.net>> wrote: Once upon a time, Josh Luthman <josh@imaginenetworksllc.com<mailto:josh@imaginenetworksllc.com>> said:
Voyager is using radio waves, which travel faster than the speed of light (in a vacuum, too!).
No... -- Chris Adams <cma@cmadams.net<mailto:cma@cmadams.net>>