Why does the constellation change?

Because of the change of the earth's axis, the movement of the solar system and the movement of the stars themselves.

I only changed it once in a long time. This change has been two thousand years since the last time. It used to be twelve constellations, but now it is thirteen, and there is another Ophiuchus.

This is new.

Aries: 04/ 19-05/ 13

Taurus: May 6, 22.

Gemini: 06/23-07/2 1

Cancer: July 22 -08/ 10

Lion: 08/11-09/16

Virgo: 09/17-10/31

Libra:111-1/23

Scorpio:11/24-1129

Snake Man:11/30-12/17

Sagittarius:12/18-0119

Goat: 0 1/20-02/ 17

Water bottle: 02/ 18-03/ 12

Pisces: 03/ 13-04/ 18