Dr. Bill, it wasn't easy for me to get much from it, but after comparing the graphs of the different solstices, I at least got some idea. At the fall and spring solstices, the sun rises and sets exactly on the imaginary east-west line running through the earth. At the winter solstice, it rises and sets a litle south of this line, making its orbit somewhat like a squashed circle. At the summer solstice, it rises and sets a little north of this line, making its orbit stretch towards being elliptical. I think. Again--this was a drawing for the Northern Hemisphere. At this time of night, I can't make my mind see it all in reverse for the Southern.