Earlier I described the Angle of Attack as being a straight line drawn between impact and separation reasoning that that was what the ball knew. Homers definition would have it , the angle , the straight line as drawn between impact and low point.
We need to adopt this definitionally to be consistent with his drawings in 2-C.
It also presents another interesting observation in regard to how the same thing , geometric line or clubhead path (ie arc, tangent , cord , circle etc) when viewed from a different perspective , point of view takes on a different name . So again , to understand Homer's geometry his words on the subject , you must understand the implied perspective to each of his terms. Words make it all sound too complicated again. Here are some drawings courtesy of Daryl and a post from Yoda.
The very same line when viewed from a looking straight at the golfer perspective , caddy view or from the players perspective is called two different names. Namely , the Angle of Attack and the Angle of Approach are the very same line, the very same cord on the circle .
Talking the "true" geometric (clubhead's ) Angle of Approach here , not to be confused with other similarly named concepts, procedures. I.e. this is the clubHEAD'S Angle of Approach as distinct from other components line of flight , path which may also have their own Angle of Approach . Right Arm, Right Elbow , #3 pressure point , Right Knee..... anything that moves forward during impact could have an angle of approach logically.
The true geometric Angle of Approach relates to the Delivery Line of the club head. The clubhead path . The circular orbit is the clubhead's (sweetspot's) orbit after all , nothing else.
The clubhead does not travel the straight line Angle of Approach or the Angle of Attack. It travels the circular orbit. Despite what you might have read , heard from various sources. It must be so and it is so. There are no "flat spots" to the circular clubhead orbit!!!!!