4 ms·

I think they were alluding to the fact that it is impossible to measure the one-way speed of light, and even the definition is an assumption based on the two-wa

• 6nf 6y ago
  Since the one-way speed is impossible to measure can we just define it to be half of the two-way speed? There's no way to tell if that's correct or not but it makes no difference in any measurements you could make. So maybe for convenience we can just choose the one-way speed to be half the two way speed to simplify the calculations.
  • triclops200 6y ago
    That's exactly what's done most of the time, but it should be noted that it's convention and assumption.