Is there any official "critieria" that you would go by? What constitutes a "professional astronomer."? I just got my 90mm Mak-Cass scope in (Celestron), a eyepiece for 100X, and when it warms up a bit I plan on taking every opportunity to observe, and also keep a log book. Tonight I did some light observing of Saturn-the first planet I've seen through a scope - awesome! I'm 34 and sound like a little kid don't I! Can't wait to get started!