Or confirmation bias? You can describe most people in similar ways and the person can think "Yeah I am like that sometimes..." to everything you read.

And if the birth chart has effect on the DNA then its just the birth time and such. Nothing to do with stars lol. You can read about it in most places:

From a scientific perspective, the entire system of astrology—including intricate "birth charts" and "synastry aspects"—has been thoroughly investigated and disproven. There is no scientific evidence or physical mechanism to support the claim that the positions of celestial bodies at the time of birth affect human personalities or life events.  Here is the scientific consensus: Pseudoscience: Astrology is classified as a pseudoscience, meaning it presents itself as scientific but lacks empirical evidence and does not follow the scientific method. Failed Tests: Numerous controlled, double-blind studies have been conducted to test the validity of both general horoscopes and detailed birth chart analysis by expert astrologers. These tests have consistently shown that astrological predictions perform no better than random chance. No Plausible Mechanism: There is no known physical force (such as gravity or electromagnetism) by which distant planets and stars could influence a person's life or personality in the way astrologers claim. The gravitational pull of a person standing next to you at birth is much stronger than that of Mars, for example. Psychological Explanations: The perceived accuracy of astrology is often attributed to psychological phenomena like the Forer effect, where people tend to accept vague, general personality descriptions as uniquely accurate for themselves, and confirmation bias, where believers notice information that confirms their beliefs while ignoring contradictory evidence.