Charles, I seem to recall your modeling of the sunlight striking one of the pipes and estimating the time from that. I also think it was John Mytton who suggested that idea as a possible way to time the photo. I thought that work was in this thread but can't find it either.
Yes, I think that there’s a patch of sunlight visible on the inside of the East wall just south of the southern most window that was used. I think that both of us could now get more precise and have more confidence in the results now that you have made some window measurements, etc. on-site. I think that I will see what I come up with first chance that I get.