There are no known way to reliably measure speed on light in one direction. You could reliably measure only a time-of-flight forth and back using reflection from some object. That does not mean that speed of light travelling forth has to be equal to speed of light travelling back.
There are no known way to reliably measure speed on light in one direction. You could reliably measure only a time-of-flight forth and back using reflection from some object. That does not mean that speed of light travelling forth has to be equal to speed of light travelling back.