Greetings all! At the moment I'm completely overwhelmed by the sheer number of words. I admit it -- I can't keep up. Trying to answer questions on several topics from vociferous protagonists is beyond me. Methinks I'll just watch and listen awhile. J A -- I think your current arguments are definately looking in the right direction. Allen D -- I am not seeking to escape from my offer to collaborate in clarifying your illustrations but it does seem the need may have passed. What is your opinion? Philip M -- I'm sorry if I confused you, but when a man speaks the truth, only a fool disagrees -- and my mother raised no fools. Before throwing in the towel, I went looking for some astronomical data to help in framing a contribution -- it doesn't seem easy to find -- and chanced to be here - www.public.iastate.edu/~astro.120/pdf/Exam1Sample.pdf If any of you get bored with the inactivity on the forum, perhaps you'd like to take the test? Points -- lest any detect capitulation on any point which I have defended, you would be in error. I don't know whether the star trails question will continue to have relevance but I'll keep thinking about it. Paul D National Bingo Night. Play along for the chance to win $10,000 every week. Download your gamecard now at Yahoo!7 TV. http://au.blogs.yahoo.com/national-bingo-night/