According to the FAQ the sun is 32 miles in diameter. And sense the earth doesn't rotate around the sun, it must be less massive. This means that the earth is more likely to undergo nuclear fusion than the sun. So since the earth is flat and does not fuse nuclei, the sun must not produce light by way of fusion and it is not a star. What is it and how does it produce light?
FE'rs do not even admit that the Sun should be seen smaller and less bright at dawn and dusk than at midday.
It is true, either the Sun would be far too small to have started fusion, or it would be far too small to contain enough chemicals for a fire that has been burning for billions of years, or it would be a brown dwarf (a star that started being several times the size of the Sun as modern science knows it and imploded.
There is no way to do a single important prediction about the Sun starting with Rowbotham's idea of a cosmos.
As long as we talk about the Sun, there is another problem to consider: The Sun distributes, on average throughout the year, the same amount of energy to both poles. But while the Arctic is a medium-sized island, Antarctica is a huge rim more than 60000 miles long.
If the energy received by the Arctic is just enough to keep water at -40
oC to 0
oC, the vastly greater Ice Wall, distributing the same energy on many times the area, would hve a temperature of at most half that of the Arctic (and that is being very, very generous with FE). That means the Antarctic would have temperatures of about -150
oC and lower, and that is cold enough to liquefy nitrogen.