Chris:

Yes...a couple years worth might say more (though maybe this type of study is in somebody's paper to be published sometime maybe ?....referred to by Lowell maybe ? I'm just speculating on this...guess Lowell will say either way if he is able to).

360/n + the 103 shadow zone. I seem to recall that the angles he gave don't all follow such a simple pattern. Maybe he revised it based on empirical data (observation)?

LOL...looks like the 'cat is out of the bag' anyway regarding asking Lowell if it's OK .... Maybe there'll be lots of meowing going on around here....

.02