The most basic mathematical principle of billiards aiming is the so-called "hemisphere method", as shown in figure 1, that is, the correct aiming point is on the extension line connecting the center of the ball bag and the center of the target ball, one ball away from the center of the target ball (that is, the contact point with the surface of the target ball is half a ball away). No matter what the position of the cue ball and the target ball is, that is, how many degrees the angle α is in the figure, as long as you aim at the point A when hitting the ball, you can definitely send the target ball into the bag (of course, the angle α must be less than 90 degrees). ?

This method can assume that a virtual billiard ball is just tangent to the target ball, the connecting line of the two balls is aimed at the ball bag, and the aiming point is the center of the virtual ball, so this method is also called "virtual ball method". Because the aiming point is on the extension line connecting the center of the pocket and the center of the target ball, it seems that this line has a tail half the length of the ball, so it is also commonly known as "finding the tail". Aiming is the most important part of billiards basic skills. Billiards requires high accuracy, and it is difficult to hit the target ball into the bag with a slight deviation.

Billiards:

Billiards, also known as billiards or billiards, is one of the ball games. It is a sports and leisure project in which athletes use clubs with a length of more than 9 1.4 cm to hit the main ball and the target ball according to certain rules. There are two different views on the origin of billiards: one thinks that billiards originated in England in14th century, and the other thinks that billiards originated in France in 15 10 year.

Billiards first became popular in France in the18th century. Since the beginning of the 20th century, billiards has gradually become a competitive sport. 19 19, the British bagging and snooker management Committee was established. 1940 World Billiards Union was established. On March 2002 1313, ACBS announced that billiards will become a part of the 2030 Doha Asian Games.