I thought I'd look at something to do with the sun on a flat earth that isn't "why can't I see it at night" or something to that effect.
Basically the pool of light created by the sun isn't a consistent shape and changes based on the time of year.
For the following I've used what I'd call the standard FE model with the North Pole at the center and the sun orbiting the North Pole at a fixed height but varying diameter based on the time of year. I've assumed that the sun in the model orbits at a consistent speed of 1 orbit per day, or 15 degrees of the orbit per hour.
I started by collecting the the sunrise and sunset times for varying latitudes for 3 times of the year 20th December, 20th June and 20th March.
I started at 80
o north as the north pole really only experiences 1 sunrise and sunset a year and I only went down to -60
o as there's not much land mass below this apart from the "controversial" Antarctica.
Please be tolerant of the following diagrams, I'm not very good with computer art programs and have been experimenting with CorelDraw and I'm finding stuff like the fill function tempramental.
So I started by plotting the sunrise and sunset times for 20th June. The pool of light, or should that be the area within which the sun is visible is the blue area. The circle in the middle is the arctic circle.
Next I plotted the times for 20th March, this was a nice simple one in comparison as the sunrise and sunset pretty much follow lines of longitude. Again the blue area is the pool of light created by the sun.
I was going to plot the times for 20th Dec but then I noticed that they're just the mirror of 20th June so I just moved the sun. Again the pool of sunlight is the blue area.
As you can see the area within which the sun is visible changes throughout the year and you get strange situations like the sun creating a straight line of day/night during the equinox or during the southern hemispheres summer the people south of the equator being able to see the sun rise and set before people north of the equator despite the northerners being closer to the sun.