Moon in SH5 always makes me sad... It`s usually wrong lighted at night. I`ll try to explain it with pictures (sorry for my "great" Photoshop skills).
At the first picture (made from game screenshot) the "upper side" of moon is lighted. It means, the sun is ABOVE horizon while it`s actually below (it`s night!).
Second picture shows how it has to be: sun is below the horizon.
P.S.: sorry for my poor English... ))