"the one way speed of light is a convention" is a new concept for me.
I suppose that's like saying, "It doesn't matter if it's different in each direction", but that doesn't sound right, because if the speeds *are* different, it would mean that stars in the South could be a lot closer than stars...
If microphone detects *this*, the each-way speeds are the same:
--I----I----I----I----I----I----I----I--
But *this* means they're different:
--I---I-----I---I-----I---I-----I---I---
Here's a thought:
How about comparing the speed of light in two directions with sound pulses?
Use two light and sound pulse detector/generators say, a kilometre apart, bouncing pulses back and forth (based on light detection) and listen with a microphone in the middle. If the speed of light is...