I'd agree that is a very simple explanation. From some of the "engineering" I did I learned that the air is thinner the further you get away from the equator. Actually, factored latitude into standard calculations for what I was doing at that time. So I'm not completely out of it.
I really don't think the griffith link makes your arguement. Although, it is fun to see your link for the "Ahmanson hall of the sky", the Ahmanson Foundation was a client of mine. Of course I've been retired for 13 years now.
Correct me if I'm wrong, at the furthest north, the sun is directly overhead at 23.5 latitude. Therefore, a location like Hayward Field, which is at 44 latitude, will never have the sun directly overhead, nor will the sun be north of Hayward Field, correct? Or am I missing something?