My own ideas; no "authoritative" view is represented here.
I don't know if it's due to Rukl's choice of projection, the current degree of libration or something else but Schiller and particularly the features to its North are nowhere near as shallow in perspective as they appear on the Section 71 drawing. On my sketch it's almost like I was drawing from a overhead view. It doesn't seem oblique at all next to Rukl's drawing. [Akkana: there was a strong SW libration that night. I agree with Brent that it was much less foreshortened than Rukl shows.]
There's a brightly lighted feature that shows up nicely on the Moon-LIGHT Atlas photograph of Bayer between Bayer and Schiller proper. That ledge inside the Northeast wall of Schiller has a peak or prominance on it that was really catching some early-morning sunlight. I marked it as very distinctive on my sketch and it's just barely hinted at on Rukl. I want to look again when I can catch evening lighting and see if it appears or not.
Finally, the area to the North and East of Bayer has a number of craters shown in Rukl. I couldn't catch any individual features but an entire area, quite large (perhaps four to six times the area of Bayer itself) seemed outlined dimly. I suppose it is due to poor seeing that "A", "F" and "H" weren't seen as individuals but only as a general grouping or depression.
With Bailly's eastern wall just inside the terminator, it has that long low light angle that brings out the best in the fractured features inside. This is another highly underrated lunar view, both from the standpoint of intricate challenge and simple aesthetics.
Also interesting is sunrise over Bailly. Along the internal terminator line we could see what looked like a long line of mountains, presumed to be an illusion created by several small craters and whoknowswhat... a neat effect nevertheless.
David North, in a Section 71 entry in The Hitchhiker's Guide, mentions the interesting shadow games at sunrise on the "internal terminator" just inside the South wall of Bailly. I spent most of my viewing time observing the changing shadows along the lighted South wall, which brightly separates the "internal" terminator from the main one.
At 9:50PM EDT, the main terminator and the "internal" one were parallel with quite a wide lighted separator formed by Bailly's South wall. There were two notable exceptions. The brightly lighted Western tip of "B" appeared to be casting a fairly narrow shadow down into the "internal" terminator, across the lighted South wall and all the way to the main terminator. The formed a shadow bridge across the South wall.
As a few minutes went by, a similar bridge of shadow crossed the opposite, Western end of the South wall. At first it was very narrow at about 20% of the distance in from the West end of the South wall. Fifteen minutes later, a wider bridge of shadow had descended to almost cross the South wall but with a sliver of light remaining right up against the main terminator.
I could not tell what features, presumably along the North wall of Bailly, were casting these shadows. In my very limited Lunar observing so far, it was the quickest motion I've ever seen. I guess low-angle light can cause shadows to move with apparent speed several times that of the actual march of the sun across the Lunar surface.
|Chart 70||Moon-Lite Atlas for chart 71||Chart 72|