How to aim when shooting
Three points and one line means that the notch of the sight gauge, the center of the sight, and the target are in line, regardless of where the eyes are. The eyes are only used to check whether the above three points are on a line.
Do you know all these names? The notch of the rear sight is on the back of the gun, and the crosshair is on the front of the gun. When these two points are in a straight line with the target, the muzzle of the gun is pointed at the target.
In fact, when aiming, the four points of the eye, the notch of the sight, the center of the sight, and the target are in line. Only in this way can you check whether the notch of the sight, the center of the sight, and the target are on the same line. When you aim with your right eye and switch to your left eye, your left eye is next to the gun and not on the extension line of the barrel (i.e., the line connecting the center of sight and the gap). You need to move your left eye to the right first. Only when you reach the line connecting the gap and the crosshair can you aim. This is when you will find that the gap, crosshair, and target are still on the same line.
Of course, you can move the gun without moving your eyes, which is equivalent to changing the angle to hit the target (the target is the center of the circle, and the aiming lines you aim at twice are two radii, both pointing to the center of the circle) )