@AEtherTopologist could you reupload this project but upload the entire project folder and not just the .blend file? The reason for this, is that there are textures missing if we use just the .blend file. I was able to re-allocate the world map and the celestial sphere texture , but I think there might be more missing.
I’m interested in what I see / what you did in the celestial sphere
You’d simply zip the contents of the entire project in 1 folder and share it there.
Also I’m not sure if you’re aware, but for fun, there’s this other model , its very simple non to scale and just for demonstration.
CONCAVEEarth.net Free Concave Earth Model V2 - Includes added elements over the previous free model