Thanks for the calculations and information, Norm. By the way, for those new to our list, please note that all of Norman McLeod's references to 'being worried' and to a '"craft"' *are* intended to be tongue in cheek! :) Clear skies, Lew Gramer To stop getting email from the 'meteorobs' list, use the Web form at: http://www.tiacdot net/users/lewkaren/meteorobs/subscribe.html