Here is a question no flat-earther I have met or heard has been able to give an answer to:
If the Earth is flat and the North Pole is the center of a circular flat Earth, then . . . distances in the southern Hemisphere are much greater between lines of latitude than distances between the same lines of latitude north of the equator.
This means that the sun (according to the flat Earth theory) must travel a greater distance each day in the southern summer than it must in the northern summer. Thus the sun must travel faster in the southern summer.
But if the sun travels faster, then the length of summer daylight for locations in the southern hemisphere will be shorter than for comparable locations north of the equator. The problem is that this is not what the objective evidence shows. Locations equally north and south of the equator will be found to have almost exactly the same length of summertime daylength.
So, to solve this problem, some flat-earth people will say that in the southern summer the sun rises higher in the sky: thus is gives light to a wider area, lengthening the time of daylight. Problem solved? No, now there is another problem. If this were so, then then that increased area of daylight would also affect the time of sunlight at the equator. Thus one would expect that in the southern summer the time of daylight would also increase at the equator. But does it? Absolutely not! The objective evidence at any spot on the equator at any time of the year is exactly 12 hours of daylight year round.
Flat-earthers - Can you resolve the dilemma?