This is what I observe. And I have spent a bit of time taking pictures and video of our sun disappearing.
The problem is that most folks have locked in their brains that when the sun sets, they see something like this:

In reality, the above is just a distorted and quite magnified mess that actually hides the sun "setting" or actually receding behind it, until ultimately it is gone.
The brightest yellow circle in the center can be seen here, still behind what's left of the distorted, refracted light, still receding, and still above the horizon:

In real time it looks like this:

As far the op's suggestion that the sunset somehow debunks fe, please consider from a video I shot myself, that even when the crazy, distorted image from the sun begins to look like it is setting, a simple zoom can easily show that this is not the case.
Because the camera is able to resolve images at far greater distances, we are able to see how high in the sky the sun still actually is:

The above could never happen on a ball.
ALL parallel lines will converge at the same exact vanishing point because that is how our world works:

Hope that made sense.
The problem is that most folks have locked in their brains that when the sun sets, they see something like this:

In reality, the above is just a distorted and quite magnified mess that actually hides the sun "setting" or actually receding behind it, until ultimately it is gone.
The brightest yellow circle in the center can be seen here, still behind what's left of the distorted, refracted light, still receding, and still above the horizon:

In real time it looks like this:

As far the op's suggestion that the sunset somehow debunks fe, please consider from a video I shot myself, that even when the crazy, distorted image from the sun begins to look like it is setting, a simple zoom can easily show that this is not the case.
Because the camera is able to resolve images at far greater distances, we are able to see how high in the sky the sun still actually is:

The above could never happen on a ball.
ALL parallel lines will converge at the same exact vanishing point because that is how our world works:

Hope that made sense.

