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notes.md

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+# Ball Trajectory Calculations
+
+- `V` is initial ball velocity
+- `h` is the launch angle
+- `g` is gravity
+
+## Flight Time
+```
+t=(2*V*sin(h))/g
+```
+
+## Max Height
+```
+z=((V^2)*sin^2(h))/2g
+```
+
+## Total Distance
+```
+d=((V^2)*sin(2h))/g
+```
+
+# Terminology
+
+## Angle of Attack (AoA)
+The up or down movement of the club as it impacts the ball and the angle is
+relative to the ground. Drivers should have a positive AoA as you hit up on
+them, irons are negative as you hit down on them. This is basically the
+positioning of the player forward and backward on the ball. The following chart
+uses values from -10 to 10 degrees.
+
+[Chart](https://southamptongolfclub.com/wp-content/uploads/Ping-Launch-Angle.jpg)
+
+## Dynamic Loft
+The vertical angle of the club face at the center-point of contact between the
+club and ball at the time of maximum compression. Dynamic Loft is the amount of
+loft on the club face at impact and is measured relative to the horizon. It's
+the degree/angle of the club face.
+
+## Launch Angle
+The ball's launch angle is **85% dynamic loft** + **15% angle of attack**.
+```
+A(L)=(.85)*A(l) + (.15)*A(a)
+```
+- `A(L)` is the launch angle
+- `A(l)` is the dynamic loft angle
+- `A(a)` is the angle of attack
+
+## Swing Speed
+The speed of the golf club, generally measured in mph.
+
+## Ball Speed
+The speed of the ball immediately after impact from a golf club, generally
+measured in mph. Calculation:
+```
+Vb = Vo * cos(t)
+```
+- Vb = Velocity of the ball
+- Vo = Velocity of the swing
+- t = Launch Angle
+
+# Course Measurements
+As it stands, with the example/trial course I made if **1 pixel equals 1 yard**
+then the hole is 512 yards, which would be an appropriately sized par-5. This
+seems proper.