Why do people who celebrate their birthdays according to the lunar calendar change their constellations?

That was when you were born, not this year's astrolabe, or when you were born, you were photographed in space at different times and places, so everyone is unique. The time can be the same, but not the same place. That is to say, your personality and destiny have 28 constellations ruled by the stars in the sky, and then the years pass, as you said, and change.