First of all what an awsome video. But its fake. You can see in the software there was a "source of light". It was located about 75 degrees off the ground perpedicular to the runway (basically with the runway running left to right it was located in front of you 75 degrees up). As the plane passes this CGI light source, the shadow moves away from the plane as if you walked in front of a flash light. If the plane is on the left of the source the shadow is on the left of the plane, if the plane is to the right of the source then the shadow is on the right of the plane. This works if the sun is located 20 feet from the plane, but not 92 million miles, the shadow would stay to the left or right, or right below it.