Thanks for that explanation, Trevor. I understand what you are saying yet, to me, the moon is apparently rotating only as seen from 'background stars.' So your students are the 'background stars' and can see a rotation but your Earth student is seeing only one face as though it is locked in a gravitational grip. This is what I puzzle over. And as a qualified Industry Trainer (retired) I understand that adults need to have insight to properly accept a new concept. Quadratic equations were a puzzle to me once but I was able to use them. Then one night at sea I was about to drop off to sleep and I began to think about QE and suddenly I was hit by insight and understood how they worked! Aha!
Perhaps I need to meditate on this problem in order to get the insight that I need. Or a kick up the rear!
Cheers!
Bert