Does the sun over the flat earth gradually get farther away from viewer?

On a flat earth model, as the sun moves it gradually moves away from the observer into the atmosphere, and thus should be smaller at sunset than noon. If that's the case please explain this:

Observations of the Sun and Moon show that the angular size of each is not related to the daily elevation angle thoughout a day. Rather than just point out the comparison at noon/sunset (something that is frequently done and which then can lead the conversation off into some unnecessary directions) it is prudent to observe that the angular size remains constant for all elevation angles from sunrise to sunset.

If the Flat Earth model to which you refer is that the Sun and Moon move away from the observer without any intervening optical effect altering the angular size, and that the edges of both are physically the same size, then you are correct. The Sun would change angular size during the day.

There is therefore an inconsistency with either the assumptions or the model. The observation is not in dispute.

Some Flat Earthers are trying to introduce "atmospheric magnification" (they call it atmoplanic), but it has two problems.

One, both mirrors and lenses require spherical surfaces to achive positive or negative magnification, and they say the air layers are flat just like the Earth.

Two, Sun is 3000 miles above the ground and air layer is only 20-30 miles thick (effectively).
To have required magnification properties it has to show them on every other object above the ground or on it.

I forgot one more thing: Third problem would be selective magnification of the Sun and not the gap between Sun and ground.
Sun itself gets magnified as goes away, while at the same time (through that same air) its apparent distance from the ground gets reduced.

Some Flat Earthers are trying to introduce "atmospheric magnification" (they call it atmoplanic), but it has two problems.

One, both mirrors and lenses require spherical surfaces to achive positive or negative magnification, and they say the air layers are flat just like the Earth.

Two, Sun is 3000 miles above the ground and air layer is only 20-30 miles thick (effectively).
To have required magnification properties it has to show them on every other object above the ground or on it.

I forgot one more thing: Third problem would be selective magnification of the Sun and not the gap between Sun and ground.
Sun itself gets magnified as goes away, while at the same time (through that same air) its apparent distance from the ground gets reduced.

Sounds like a load of bulldust. The sun is 150,000,000km away and its the rotation of the Earth that causes the day/night (sunrise/set) cycles. Everyone should know that