Found a simple and effective sun positioning addon for Blender,
It can be downloaded here:
The addon is easy to install like all other addons in Blender,
Once installed you will find it’s controls in the World settings,
You specify a sky environment map and a sun node and it will control them acording to given latitude longitude, date, timezone ect.
Also lets you set the north direction of the system as needed.
Very simple and very effective.