It seems the moon phases are not accurate. I set a date for a full moon according to NASA's list, February 12 1941, and I get a waning crescent.
And I'm having trouble with letting the radio play music. I chose and placed an mp3 in the Grossdeutscher_rundfunk folder, nothing happens but the usual static. I even decoded and recoded the file to see if the underlying format was an issue. Hmmm... maybe I should try enabling music in the options menu?
Yep, that did the trick. Now to get rid of the menu music. Very cool that the music is more distorted during twilight and indeed influenced by distance. By the way, testtrack was Asche zu Asche by german metalband Rammstein