alt Hacker NewsBefore you figure that out, you will be surprised to discover that it's impossible to tell if the speed of light is the same in both directions, with only the average of a round trip being the speed of light.
See: https://en.wikipedia.org/wiki/One-way_speed_of_light
Anyway, reading that should help you answer your own question, or at least give you a lot more questions to ask.
Criticism: It's not literally impossible.
I hate this one because it's true Einstein said we cannot measure the speed of light in one direction that is independent of the clocks' synchronization technique being used to measure.
And yet, somehow we changed that to "we don't know the speed of light in one direction!!!" Which is bogus - can you imagine if speed of light was different if you were pointing east vs west? In space, what is even a direction vs another?
Did you even read the wiki you linked? We've done one-way speeds, it's down below.