Is it accurate though?. If I fix the time and slide by the month, I expect the shadow to move east to west, but it only grows or shortens, which would mean the sun is exactly at the same vertical line on ground every day of the year but the height above horizon changes.
It shouldn't be on a vertical line, it should follow the solar analemma for your location. It's essentially trivial to add this, I think the creator just needs to add equation of time correction?
