Moving shadows on landscape? Where are they from? Can i remove them?

Hi , wondering if anyone knows where these moving shadows come from? It looks like cloud shadows but sky is clear. I have “Goodsky” day/night cycle on and they pretty much move with the speed of the day. My lightsource has “cast shadows” unchecked. Cant seem to figure where they are coming from. any help? Thanx Imgur: The magic of the Internet

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		  			 			[FONT=&amp][SIZE=13px]Never fails , cant figure it out , then you post and right away find the answer. It was the light function material in the light source.

Was it used to simulate cloud movement ?

Im not sure , it was just in there. Probably , as it definitely looked like cloud shadows.