The actual paths of these objects from a side view is immaterial. Your side view model is just a theoretical construct based on Euclidean space for how things *should* be positioned based on some continuous trigonometry rules.
Actually, the side view models you are looking at here are composed of pixels. They are a representation of a discrete space - so why can't you draw one - just one, not two from two different perspectives - that represents what you say is actually happening? Or are you saying there IS no objective reality?
Here's what I'd like to know:
You say a perfect straight-line bullet fired perfectly horizontally at the setting sun would hit it. And I agree that it would, eventually, if we discount all other relative motion that's going on.
I can't see how that happens in your version of reality, though.
Let's suppose this perfect straight-line bullet is slow enough to follow in a helicopter. So we stand on a cliff, aim perfectly horizontally at the setting sun bisecting the horizon across the ocean, and pull the trigger. Then we get in the chopper and follow it. We take a radio with us, and an observer back on the cliff confirms that we are converging perfectly on the horizon, heading straight for the sun. We fly and fly and the bullet just keeps going, a couple of hundred feet above the waves. We catch up with the sun (which we've paused for the duration of this experiment), and it passes 3000 miles overhead.
Why didn't the bullet hit the sun? We aimed right at it and fired in a perfectly straight line, and our observer on the radio told us we were heading straight for the sun - but somehow we've managed to 'hit' the bottom couple of hundred feet of 3000 miles of empty air that we couldn't even see when we took the shot!
Let's say we try again, and this time we aim up a couple of degrees, just to make absolutely sure. We follow the bullet again, and it does get higher this time, but it still passes almost 3000 miles below the sun.
To me, it seems inarguable that if we want to hit a sun that is in reality 6000 miles away and 3000 miles in the air over (approximately) flat ground we
must fire it at an angle to the ground that will cause it to rise 3000 miles over the course of 6000 travelled horizontally. And if that's the case, then that's the same angle the sun must appear to us in the sky. Doesn't that make sense to you?