The aim, using horizontal center line right through the eye with a bow that is retrieved at the bow and to bend over zero, zero point the spot on the target to shoot.
The centers aim A line of sight right through the bow string pulled a point bent. Through the center of the bow The center point is the point that needs to be shot on target.
Aiming with zero. To line of sight right through the strings pull to the point now through the centre at the bow. And zero pointing in the address points on the target to shoot.