Western constellations are based on the Gregorian calendar. No matter what year a person was born, his or her horoscope is judged according to his or her date of birth. This is a bit like the China Zodiac. No matter which month you were born, as long as you were born in 1987, you are a rabbit.
China is based on the lunar calendar. To know a person's date of birth (lunar calendar), you must have a birthday born at a specific time of the day to judge a person ~
10.9 is Libra.
4.28 is Taurus ~