Nothing gets past you, Ulco! Of course it is.
Well, they are planned over duplicate, resized bg spheres, not planets, but the very same idea, yes.
I had a mind to swap over to planets once the 'rotate with textures' button comes to the public(if it doesn't go public, I'll force it by editing the text so it'll work regardless) but it doesn't work right now like that.
I like the idea that I could make a celestial precession sequence from ground level but it doesn't work with spheres as you can't rotate them, I always wondered why a TG sphere has no rotation parameters, it's not like it wouldn't be extremely useful.
In fact, now I see these thoughts written down, I think it will be much better to just keep it as regular spheres and rotate the textures only. I think that's what I'll do, I'd rather one rotation control to drive the precession than how ever many final layers of stars will be in the finished 3D background, as they would need adjusting individually...