^^^ I'm not quite sure what you're going on about but, I have seen images of the Sun taken in Antarctica where the center is black, a black hole (not a slit) Sun. I'm unsure whether this is an artifact of the camera's optics or if it's actually visible with the naked eye.
My current understanding of how the Sun is projected is that what's being reflected off of the firmament are scalar waves; compression waves (like sound) not transverse waves (like light). The light comes from the plasma the scalar waves create when they converge on an upper atmospheric layer. I'm theorizing the layer is a superfluid helium and/or hydrogen with liquid crystal properties.
Also just so we're clear the firmament doesn't move or rotate, it's the celestial bodies that move.
Well, if the sun is a concave mirror, what would it look like if it were seen 90 degrees on edge? Depending on moonlight or star light shining off the back of it, you might not see it at all, right?
But the more important thing is viewing it from many other degrees, less than 90, but more than zero, direct, head-on. I mean, you would see it as a slit. Only the people directly under it would see it as a circle.
Do you ever see the sun as a slit/cat's-eye, of varying sizes depending on the angle? For example, if you were seeing the concave mirror from the side at, say, 10 degrees above the horizon line, and it wasn't directly facing you, you would see a slit-like "something." But the sun never appears that way. So there is a bunch of stuff you aren't thinking about - but at least not explaining - in your playfulness in this thread.
