What a Load of Capricorn
When someone says that your [planet] is in [zodiac sign] it means that the sign embodies the energy of that a specific planet. For instance, if your Mercury is in Capricorn, it means absolutely nothing because all of this is complete gibberish!
Now, you could argue with astrologers about how the sun and the moon and the stars and other astronomical objects have absolutely nothing to do with each other, you’ll only end up wasting your breath. We’d love to see a debate between a Flat Earther and an astrologer. Or are the two not mutually exclusive? That would probably explain a lot.