Milsurp Sights  Theory and Practice
Posting this as I think some may find it an interesting video on milsurp sights / adjustments from the Anvil crew. Starting at about the 3:50 mark is a very interesting and clever (IMO) take on calculating sight adjustment.
A couple of disclaimers as my intention is not to start a flame war about the veracity of video, I am neither promoting or voguing for the technical accuracy or mathematical correctness of this video :) https://www.youtube.com/watch?v=Wjl0p4hYzFw 
Pretty good video. The example and graphics of calculating sight movement was unnecessarily complicated and not clear or complete. It is much simpler using a ratio and not calling it a constant. The triangles should be overlayed so it is clear the angles match.
If you can’t recall how to derive the equation, it is Sight adjustment = (sight radius)*(impact distance from Point of aim)/36/(distance from target) Sight adjustment, sight distance and sight radius are in inches and distance from target is in yards. 36 is the conversion of yards to inches. 
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Sight adjustment = (sight radius)*(impact distance from Point of aim)/(36*(distance from target)) :D 
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The units on both sides of *any* equation must be equal. That's a Universal Law. It gives you an easy way to check veracity of any proposed equation. In your formula, units on both sides are not equal so it isn't really an "equation" :D 

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