Argument about Night and day / seasons:
in FE model, sun and moon move in circular pattern over the plane: but we know that at any given moment half the earth is in daytime and the other half in nightime, and this is not what the model shows.
as for seasons, we see the sun always moving in the sky at the same speed. In FE model, the sun changes its orbit from summer to winter, with the winter one being much longer. Assuming that the speed of sun is always the same, why the seasons are all of the same duration?
One thing that you are really going to have to understand is that there are many different models and the day and night season functions VERY differently between the different models.
Even if we are looking at the same base model, like the one which is pushed here which looks like a flat circle with the north pole in the center, no dome, an ice wall and an earth of unknown size there are different concepts and ideas which can be used to answer your question vary drastically.
I'll give you a few answers for the model which looks like a flat circle with the north pole in the center, no dome, an ice wall and an earth of unknown size as to why the seasons are the same duration even though the conceptual movement of the sun speeds up and slows down.
1. The sun speeds up on it's big orbit and slows down on it's small orbit.
2. Some sort of refraction because of the way the sun is moving in the atmosphere.
3. The sun is not changing it's position. it's orbiting along the equator all year round and it's the tilt of the earth that causes the seasons
4. The information you have provided is evidence against that specific flat disk model.