And a North

[Dune]

No problem at all, just use an image map shader (vague white circle) and point at the sun from the to-be-lit place. I've done it before, so it works.

[DannyG]

Love it

[mhaze]

Problem is the sun is very low and to the right!  So I have use a spotlight - still playing with that, the hole in the clouds is easy, done that before.  It's getting the light right that's the problem,  I'll keep playing.  Worth it just for the learning!