Right. He repeated his anchor to achieve consistency rather than floated it around?
I'm entertained by the idea the above gets turned into success lies in changing the anchor point.
If you are an engineer you should have an objective lens to view life through and recognize when you are making contradicting statements. You probably understand where fact and myth diverge as well.
Looking through a ring is not the same as looking through a tube. A full circle of vision can be achieved through a ring from various angles. Proof of this exists because a peep with one (or two) string groove angles works for "all" archers. There's isn't a 35deg peep, a 35.15deg peep, a 36deg peep, so on and so forth.
Hamskea's raptor chart shows a whopping 10deg of use per groove. One can see through that peep in at least a 10deg window.
Engineers do math, right? Take the trajectory of the arrow and solve for the degree of angle needed to put arrows on POA at various distances. Is there less than 10deg of adjustment needed?
I've contradicted nothing to my knowledge...
I'm well aware that looking through a ring is not the same as looking through a tube, otherwise the premise of a sliding sight would not work well at all.
I don't think this post refutes my caveman drawing at all, and since we're on the engineering route, if we were to go about this from a modeling design perspective we could lay out the varying degrees of freedom and fixed points. If you've ever used Solidworks or a similar software that utilizes assembly constraints then you'll see where I'm going with that.
Initial constraints:
2 Targets at the same height off the ground (20 and 100 yards)
Your eye is at a fixed height off the ground at the same height as the targets
The bow at full draw is a "triangle" with sides that are fixed lengths
The peep is at a fixed distance point from the release / anchor point along the side (string) of the bow triangle
The sight can slide up and down, but is at a fixed distance from the bow riser
The sight pin point center is coaxial with the target centers
The sight is coaxial with the center point of the peep
The anchor / release is at a fixed point on your face and cannot move (your assumption)
With these initial constraint conditions, it works fine at 1 distance, but you would not be able slide the sight up or down because it is fully constrained. The modeling software would not allow you to do it without opening up some degrees of freedom. What constraint can we remove to open up a degree of freedom and slide the sight? The only one on the list that would make sense is allowing the anchor point to move. Maybe I'll actually model this for real since I'm apparently way too invested in this scenario...
I'll try to explain it again since I feel that without a physical model it didn't make enough sense.
If you drop the sight lower but kept everything else at a fixed position, you would not have your sight centered in the peep any longer. If you kept your anchor / release in the exact same position and raised your bow hand up to align the sight back on target (since you slid the sight down earlier), your peep would raise up along with the rest of the bow and would no longer be in line with your eye. At that point, to realign your peep you have to pivot your anchor / release down to get the peep back in line with the sight and target.