rays that are directly overhead - just like the ones along the horizon, they too appear quite straight without you having to shift your viewpoint (even though you 'sense' that they are curving over you the path is straight from your viewpoint) rays that are 'higher' than that and splay outwards at say 45° - they start at the Sun, curve up to their maximum height at your right and left and then curve back down to the convergence point behind you rays at the horizon plane that run flat on either side of you, to the left and right, and along the horizon - they are 'straight' from your viewpoint on the horizon plane There are some conveniently placed clouds giving lovely crespuscular/anti-crespuscular rays all around - they splay out from the Sun and then re-converge at the opposite horizon exactly behind you. The sun is straight ahead of you as you look towards the horizon. What about ones coming right at us?Ĭonsider yourself standing in a wide open flat plain. Jeff, in MinneapolisThis was intended to address another consequence of the geometry - we are currently only considering lines running across (ie at right angles) to our field of view. Of vision, then I think you are mistaken. If you meant directlyĪbove or below my head, both of which are outside my field Must pass through the center of my field of vision in orderįor it to appear straight, and that's it. I can tell, a straight line (or an extension of a line segment) What did you mean by "or at 90° above/below."? As far as
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