Why does the astrology at birth determine a person's character?

Astrologers take the earth as the reference center and divide a plane called the ecliptic into twelve equal parts, namely, the zodiac, the sun, the moon, mercury, Venus and ................................................................................................................................. This is the real astrology. At present, the twelve constellations only say your sun position, which is not allowed, ignoring other stars. Astrology is to explore people's influence on the whole universe.