.Scott:
In this case, I am looking at the shadow of the wing to judge the relative position of the 737 at it crosses runway landmarks.
Surely, before any information from shadows can be included you must know the height of the sun above the horizon, its position relative to the aircraft etc. also, just minor movement of the hand holding the smartphone will change the picture. Throughout this thread assumptions have been made without knowing any of the relevant trigonometry which has just been ignored.