A twelfth of the planet doesn't share your chart.
A generic horoscope column reads the same for everyone born in a roughly month-long window. That's your sun sign — real, but only one placement among many.
Your full chart adds your exact birth time and location, which changes everything else: which sign was rising when you were born, where your Moon actually sat, how your planets related to each other in that specific moment. Two people born on the same day can have meaningfully different charts.
That's the gap a real reading closes.