Sky horizon at nighttime
The horizon of the sky is at nighttime always fading to stars, even though it's cloudy. Clouds->Stars->Black
It should instead fade to more clouds and then into black when it's cloudy (never showing any stars). Clouds->Black
http://img201.imageshack.us/img201/4726/skyan.jpg
(RM-639 from redmine: created on 2013-03-15 by Lars Söderberg, , closed on 2015-08-07 by Chris Boyce)