I appreciate the little gif showing how they say it works, but I have a hard time believing that a slight change in the angle of 23.5 degrees can make such a big difference, the sun is supposed to be 94 million miles from the earth, I have serious doubts that such a slight angle would have that dramatic effect. It might make a big difference if the sun was only like 3 or 4 thousand miles from the earth, but at 94 million miles that is like 0.000127 closer the angled portion of the earth would be to the sun than if the earth was perpendicular to the sun. I have a hard time buying into that theory.