I think you're right with NOON - 'ONe' with no ON means you're left with 'e(arth)' [and 'noon' is defined as the 'culminating point' in an orbit - the highest point].
I think you're right with NOON - 'ONe' with no ON means you're left with 'e(arth)' [and 'noon' is defined as the 'culminating point' in an orbit - the highest point].