about day-night cicle

[Zhook]

What do it do for players?

[Ishmaru]

Just purely for looks, has no effect on gameplay and can even be changed by either the configurator, or  editing glestuser.ini.

[tomreyn]

Please don't use the configurator, though (and please don't recommend its use), since it's deprecated and can create problems. People should either use the options menu or edit glestuser.ini (but never ever glest.ini) directly based on the documentation at http://wiki.megaglest.org/INI