Because the stars in the sky all look five-pointed to the naked eye.

Daily use of five-pointed stars:

The national flag designs of many countries contain five-pointed stars: such as Ethiopia, Morocco, Vietnam, North Korea, the Republic of China, the United States, etc. . Many times the middle of the pentagram is filled in, removing the division between the pentagon and the five isosceles triangles.

The inner meaning of the five-pointed star:

The five-pointed star has the meaning of "victory". It is used by the armies of many countries as a rank symbol for officers (especially senior officers). It is also often used on flags.

The pentagram has always been closely associated with the worship of Venus and Venus. Of the various possible reasons for this relationship, the most plausible are the observations of prehistoric astronomers. As seen from Earth, Venus's orbit around the Sun repeats itself every eight years. Its five intersections form an almost perfect five-pointed star.

In ancient Greece and Babylon, the five-pointed star also had special symbolic meaning. The five-pointed star is the representative symbol of magic and is the symbol of non-Jews. The early Christian church also used five-pointed stars to represent the five wounds of Jesus, and later they mostly represented pagans and Satanists.

How to draw a five-pointed star:

It is impossible to draw a five-pointed star accurately with bare hands. In some paintings, the imprecise five-pointed star gives people a relaxed feeling, but in the national flag, national emblem, and trademark, the five-pointed star must be completely accurate, and the ratio of any line segment of the five-pointed star must be equal to the golden section. This requires the help of tools. In fact, it is difficult to draw with freehand, but it is easy to draw with the help of tools. You only need to use an unscaled ruler and a compass to draw, using the ruler and compass drawing method. The five-pointed star drawn using the following method is absolutely accurate.