14 Apr '24 22:56>
Apparently, the speed of light has not been measured directly ... only by bouncing light off a mirror and measuring the two-way speed. I.e. to a point and then back again.
Measuring from point to point is fraught with the difficulties of synchronising clocks - relativity gets in the way when clocks move. Without accurate clocks, you can't get accurate speed. Bouncing light back to the start point means you only need one clock - so total speed is measurable - but not the outward, nor the return speed. Only the total.
So it's theoretically possible that the speed of light is direction dependant. But impossible to verify.
Very interesting channel - and their take on the speed of light:
YouTube
I'm sure the video will explain it much better then I could.
Measuring from point to point is fraught with the difficulties of synchronising clocks - relativity gets in the way when clocks move. Without accurate clocks, you can't get accurate speed. Bouncing light back to the start point means you only need one clock - so total speed is measurable - but not the outward, nor the return speed. Only the total.
So it's theoretically possible that the speed of light is direction dependant. But impossible to verify.
Very interesting channel - and their take on the speed of light:
YouTube
I'm sure the video will explain it much better then I could.