There really isn't any arc at all because what we all see is due to the fact that we are on a globe with a curved surface that is rotating and tilted on its axis of rotation. The sun is stationary relative to our position because we are also in an orbit around the sun. I know you already understand these things, being that you appear to understand the commonly accepted view, but my point cannot be stressed enough because in the flat-earth model there is no way for you to explain what is witnessed from the ground in the various locations and latitudes on the earth. Here is the same point once again from the most recent link which I posted on the previous page:
From a flat earth map and viewpoint you cannot explain these three different views of the path of the sun, which occur in varying degrees all of the time, each and every day, because as already stated: the three lines or circles for the tropics and the equator are actually parallel lines around a globe, a sphere, which is rotating and tilted on its axis. And this of course goes right back to the point made in the video from Pg.1 because this is precisely what the video is speaking about in simpler geometric drawings:
And as I also have already said, you would essentially need to superimpose this imagery onto the flat earth map because these are observable evidences which people see from the ground each and every day, however, you can do no such thing on a flat earth map. It blows the whole theory out of the water. A flat earth simply does not match up with what is observed from the ground by people all over the world each and every day: for those in the northern hemisphere do not see the sun doing the same thing as those in the southern hemisphere, and vice versa, and yet the tropics and equatorial circles are parallels: and therefore, what we see, we see because we are on a sphere with a curved surface that is rotating on an axis and tilted on that axis.