you start by simply knowing that there is a difference. then you follow the reminders, taking off the shadows of ideals, until you get as close as you can stand to the truth. write down what you see revolving in there, especially what exerts forces on the other and how it corrects the orbits. note the valences and tangents. try to express the forces at work on paper with diagrams. withstand the pressures until you have enough to bring back to use.