[Yoda]

I'm really fascinated with the Visual Equivalents. It's pretty cool to think that a person can set up and if they have a straight plane line, then you can see several alignments on the horizontal plane (the ground).

Question though: Why is the Angle of Approach the Visual Equivalent of the Straight Plane Line? And would tracing the Angle of Approach result in a different Plane Angle on the backstroke?

The Golfing Machine actually defines the Angle of Approach as the Geometric Equivalent of the Arc of Approach Visual Equivalent (the Clubhead Blur though Impact) of the Geometric Straight Plane Line (2-J-3).

Confusing enough?

I thought so.

Nevertheless, that's what it is.

However, in his taped Master Classes, Homer Kelley always referred to the Angle of Approach as a Visual Equivalent; specifically, of the Straight Line Baseline of the Inclined Plane that always serves as the Geometric Basis of the Stroke. It is through the Impact Point and Low Point established on this Inclined Plane that the straight-line Angle of Approach passes.

This Line may be visualized by the player as being on the ground. Hence, its classification as a Visual Equivalent. The Angle of Approach procedure results in a steeper Inclined Plane whose Line is Closed (to the Target) per 10-5-E. But, you don't Trace ('point at') this Line with the Clubhead -- you cover it. You do, however, Trace it with the Right Forearm.