And I also think Geocentrism is a viable response to Distant Starlight

Video

Distant Starlight Doesn't Disprove Young Earth Creationism (Justin Derby)
TTOR | added last day last year
https://www.youtube.com/watch?v=dTBoylLGwcg

HGL @ TTOR/JD

beginning : heard it c. 24 hours before becoming Geocentric - or less

[in the following I don't say to where in video]

and I think Geocentrism is a lot better of a coherent answer than Relativity

Especially, as Einstein was arguing against the concept of "simultaneity".

So, while in pure logic the equality between light speed at different locations or stretches cannot be actually proven, it can be much more safely assumed than Heliocentrism.

Astro Caleb

Your whole argument rests on the assumption that the one-way speed of light cannot be measured and can only be arbitrarily assumed. Yet sure enough, there actually are ways to measure the one-way speed of light.

In the 1670s an astronomer by the name of Ole Römer used Jupiter and its moon Io to measure the speed of light. He discovered that the intervals between eclipses of Io increased as earth moved father from Jupiter and decreased as earth moved closer to Jupiter. This, he realized, was due to the fact that light took longer to reach earth from Jupiter as earth moved away. He used some simple calculations to make an approximation of the speed of light. His conclusion was 140,000 miles per second, the modern value being 186,282 miles per second. In other words, Römer measured the one-way speed of light from Jupiter to earth.

Here is a video of Brian Cox explaining what I just did above:
https://youtu.be/DMKE5YGLnmc

There are also many other resources to look into his method of calculating the one-way speed of light.

HGL @ Astro Caleb

Fine, Astro Caleb.

I agree it is rather probable we know the speed of light.

How would YOU argue that we know distances like 13.8 light years?

Also - much as I disagree with Einstein, I agree with TTOR that acccording to Einstein we cannot prove light travels different distances at same speed, i e you would have to prove that light travels in "interstellar space" precisely as slow as in a solar system between Jupiter and Earth.

Also, Rømer's experiment might indicate it is not even constant - since if his measure of its speed was accurate, either ours is wrong, or the speed has changed or the speed is different between Jupiter and Earth than where our generation's scientists typically measure it.

That said, it is even more economical to simply ask how you can without proving Heliocentrism prove such stellar distances or how you can disprove Geocentrism, before we go to Einstein.