Why does the rising constellation change?

The rising constellation will not change. In western astrology, the rising star is also called the birthday star.

It is the constellation of the eastern horizon when an individual is born, and its change depends on the time and place of birth. The rising constellation of personal astrolabe is "Asc". Its concept originated in the Middle Ages, because a new element was born at that time, that is, the division of the heavenly palace, that is, the geographical division of the heavenly palace at birth according to the time and place of birth, so that birthdates can be completely personalized and the prediction accuracy can be significantly improved.