take it personally jacob, it's doing it just to annoy you, specifically you. like the raincloud that is waiting for me to pay for my ticket at this afternoon's cricket before it rains on me.
seriously no. I think this is a psychological question. You would not really mentally notice the many hours when the sun is not behind a cloud, you only mentally notice when it goes behind "a little tiddler" (usually for 5 minutes max) and assume the tiddler has targetted your portion of rays. Now - if the cloud remains in front of the sun all day, be very afraid! :-) Hope that explains