In a message dated 96-09-19 09:49:19 EDT, you write: << In George's article that started this thread, reference [1] is to "Sky & Telescope" 1993 September. I couldn't find the reference. The one I did locate was 1994 October, p.108. Was the citation incorrect? Malcolm >> -------- Yes Malcomn, you are correct...Got hung up on 1993 and September...Thanks for the correction!....Sorry! George Zay