This was actually in response to that.
Let me elaborate: Since the FE sun has to cover a lot of distance and is very close to the Earth in order to function, it also would have to change in size drastically as it got very far away.
"Glare is causing the size of the sun to stay steady even though it should shrink." explains the size, but you can filter out enough glare to
see the actual size, and see it doesn't really change. Because the sun's size doesn't perceptibly change, the distance to the sun must be changing by an insignificant percentage.