Quote: "Sometimes I like to use words out of contents"
"Context"
http://en.wikipedia.org/wiki/Context
EDIT
Forgot to add this
EDITEND
Sky Matter
CloudWright
DarkCLOUDS
I personally have DarkCLOUDS, though intensive on resources and best used on a nCore system... it is amazing though there's one slight glitch with it... but I think I may know a workaround to that... [re-init mid program] basically the clouds disappear permanently if the user moves above the clouds... brought my dreams of making a realistic flight sim to its knees
But there should also be some free sky boxes in your DBpro Media folder in the install directory I think... learn about implementing Sky Boxes

if you want fast and static... there's also a Real Time Sky [RTS] in
eXtends which works among the many dysfunctional add-ons in there, and if you bought
DGS you already have it
enough... I hope this helped
EDIT
There is also the inverted sphere cheat with a single Skybox Image
I suggest you get Hands On Dark Basic Volume
1 and
2
And about the Sun... can you be more precise? do you mean projected dynamic lighting? or a visible non effective [not projecting light] light sun? [Use the RTS sky from eXtends for that... or DarkCLOUDS for a much prettier effect

they both have day night systems...]