So, I'll jump in here with a point that I believe to be the "Unanswerable Question".  How is it possible to have exactly half the world/earth illuminated at any given time.  It works perfectly on the globe model, as a large light source, very far away, will always light up exactly half of a ball (globe) all the time.  The seasons work perfectly because of the tilt of the globe on its rotating axis, resulting in the Northern and Southern hemispheres being closer and farther away from the light source as it orbits around the light/heat source throughout the year.  It requires no speeding up and/or slowing down of the sun (for which there seems to be no explanation of how that happens).  Also, at the equator, the sun "comes up" directly on the eastern horizon and travels in a straight line to "go down" directly on the western horizon.  This is not what would be observed on any flat earth model I have ever seen (looking into this theory for several years now), nor can it be demonstrated by the FE model.  It is simply impossible on the FE but quite simple on the RE.  Given the fact that refraction from cold to warm air is only a difference of .003% (as mentioned earlier in this thread), there is no way that the shape of the light given off by the sun could ever reach exactly half of the earth, ever.  A single point of light will always produce (on a uniform surface) a round shape of light.  As I said, the only way half of the earth could ever be illuminated at the same time (as is observed every day), is with a round earth and a single light source very far away.  I am very versed in graphics and have my own CAD program.  Graphically, I have found that with the sun directly over the equator, with the light shape reaching from the middle (North Pole) to the edge ("South Pole") at best it results in approximately 1/3 of the earth illuminated which would mean that night would be twice as long as day, at the equator.  However, when the sun is directly overhead at the equator day and night are the same length.  I would really like to hear an explanation from a flat earther that actually makes sense.  I have not heard one yet so I believe this to be the Achilles heel of the FET.  If there is so much "proof" that the earth is flat, where is it?  It shouldn't be so hard to understand that you need complex equations to explain it.  The fact that the earth is a globe was observed without complex equations long before NASA ever existed.