I forgot the completely ignoring your question version of things, sorry about that.
BTW, there is no way to explain that for a flat Earth hypothesis. Hell use their great Rowbotham's own experiments and see how the sun gets closer and further away from the surface of the Earth as the day goes on and as the seasons change. Use the experiment correctly with the correct controls, like the differing points of observation being far enough apart and along the same latitude lines, and you get one of two things. The Earth is round and a close approximation of the diameter, or wildly different heights of the Sun above the Earth at the same time at the two different positions.
As for the relative speed of the Sun across the sky, they can't explain this.
The same could be said for the Antarctic midnight sun scenario. They cannot explain it so in their models it doesn't exist.