No problem Glen, I have been staying up late all week long for one reason or another and it was weighing heavily on me as well.

5 am wake up for work gets tough after a couple of "after midnight" observing sessions.
It's too bad my brain is past its prime now a days, seems like every question opens up a whole new avenue of learning, with "days" of reading.
But I do appreciate all the reference material and explanations. I secretly hope, as I get more experience, I will develop a "intuitive" ability to gauge all of this, before my eyes give out from all the reading

. I've bookmarked the links and will start reading.
I am surprised and somewhat disappointed as I thought last night was quite good, from my perspective. I easily found and tracked a couple of dimmer targets, that I have not been able to see up to now. But then maybe I'm just getting better at finding them...