Looks like the old lady was right, the Aces High world is flat.
A physicist was giving a lecture about the solar system and he said the world was round, spinning on an axis, and orbiting the sun. An old lady jumped up and yelled, "That is not true! The world is flat and on the back of a giant tortoise." The physicist, thinking he would put her in her place, asked, "And what is the tortoise standing on?" She calmly replied, "Its turtles all the way down."
Using the eur2015 terrain and the pitch ladder, I shot the elevation of the North Star from the most northern and most southern fields. The elevations where both the same meaning the Aces High world is flat and there will be no celestial navigation -- not that I would expect to be able to but figured I would check just in case. I also shot the sun but there was no difference there either.
The stars look a lot better being smaller in diameter and the Milky Way looks good.
The positions of the stars and sun look reasonable for the Dallas latitude in October.
Sky goes solid black when changing time from "3 0 0" to "12 0 0."
Terrain being used was the eur2015 terrain. Time was set to "3 0 0" while in the tower at A59 and then launched in a P-51B to the west. Took a screen shot of the North Star and then changed the time to "12 0 0" to take a shot of the sun. The terrain lighting went to day but the sky was solid black with no sun or stars visible.
Image: p81_BlackSky.jpg
Domed horizon when look towards the center of the eur2015 terrain.
A blue-grey bulge or dome becomes visible on the horizon and gets larger as the altitude increases. The attached image was taken from field A79 and looking north. The dome is offset to the east which is more toward the center of the terrain.
Files: p81_Dome.jpg, p81_dome.txt