Why did the twelve constellations become thirteen constellations?

It has recently been reported that the position of the stars has changed because of thousands of years of struggle, and the constellation has deviated from its original position compared with thousands of years ago. Some people use the topics on some forums to speculate on redefining the birthday constellation.

Today's stars began to change two thousand years ago, not with each passing day, and the division of constellations two thousand years ago was not very clear. The following information is about constellation division:

15000 years ago, people in ancient times divided the constellations into 12 in order to identify the direction when sailing. With the evolution of more than 5000 years and the research of many numerologists, 12 constellation has become the standard for many people to measure their specific personality. After more than 2000 years of improvement, it has been recognized by more and more friends. The division of constellations five thousand years ago only determined the position of celestial bodies in the sky, and the relationship between human personality and them was finally determined through the long history of human civilization and the long research in the course of two thousand years. For example: Aries: March 21~ April 20. This date was not set after 5000 years, but people decided the sex for most people according to their personality and named them after the corresponding constellations in the sky. So, when was this date set? Obviously not thousands of years ago.

Second, at the beginning, the zodiac had 12 constellations, and the zodiac was divided into 12 on average, which was called 12 palace. At this time, the zodiac and 12 are indeed one-to-one correspondence, so people are used to calling their horoscopes constellations. Due to the change of constellation division, there is an Ophiuchus next to Scorpio, and the "foot" has reached the zodiac area, so now there are indeed 13 constellations in the zodiac, but there is still only 12, and there is no change. Constellation theory based on the influence of planets near the Astral Palace on the personality of people born in this Astral Palace area. The movement of the constellation was not completed in an instant today. In its changes, people are also revising the personality attributes of the constellation to which people belong.

Third, to sum up the above two points, whether from the position of stars, the division of constellations and the establishment time of constellation theory, your constellation is still the original constellation; Aries: March 2 1 ~ April 20, Taurus: April 21~ May 21Gemini: May 22 ~ June 22, Cancer: June 22 ~ July 22 ... These are unchangeable unless the period of revolution of the earth changes.