Actually the shadow is not calculated by taking the "suns" position for now.
It takes a fixed position by script.
The sun is actually lightnig from a different direction.

When i align sun and shadow, then the mix of dynamic lightning of the terrain and the "baked" shadow will
look better.

I had a shadowbaker before that was more "realistic" by lighning the terrain in contrast to
calculating areas with shadow. but the calculation took almost a minute then.