I am getting quite a kick outta this...

Thank you Arne, John, Kaleea, PP et all! This math adds some insight to my intuition, and though my musical approach is largely intuitive/instinctual, it is really good to have relevant theory behind it. I wonder though... I don't know how to measure the absolute/relative cents of a given note. Since I play predominantly by ear, I would enjoy the verifying process of measuring existing notes (ones chosen previously by ear). How is it done? ttr