Seems to me that FE Wiki is the central reference source of all that the FET is based. Trouble is most of it is just based on simple statements that the reader is seemingly supposed to just accept. For example that the Sun is 32 miles across and 3000 miles wide. Where does that come from? And that is stated to be a 'later' estimate.
I will await a suitable explanation from someone who can tell me...
This might be what you're looking for,
https://wiki.tfes.org/File:Xlg_globe_3.jpghttps://wiki.tfes.org/Distance_to_the_Sun Flatrth.png
A little trigonometry shows that
Flateqn.png
Using the values 50 degrees and 60 degrees as measured on the trip, with
b=1000 miles, we find that h is approximately 2000 miles. This relatively close
sun would have been quite plausible to the ancients.
Continuing the calculation, we find that a is approximately 2400 miles and the two
distances R1 and R2 are approximately 3000 and 3900 miles, respectively.
This scale is inaccurate to the overall distance of the flat plane from edge to edge but does have the sun 3,000 miles up.
I believe if the scale depicted the distances in relation accurately the sum would be much closer to the surface. Which brings up a whole new set of problems.