Tarot profile and 13th zodiac sign

[Pinkish]

I remember a few years ago it was on the new that a new zodiac sign was discovered The Ophiuchus. If I look up my sign with the 13th sign I am Sagittarius and not a Capricorn. I am getting interested in Astrology due to my tarot studies and I know that 2,500 years ago, when the horoscope originated in ancient Babylon, the Sun crossed through each of the zodiacal constellations on different dates than today, approximately four weeks earlier. Anyway, as I am studying in Mary Greer's book Tarot for yourself, I am making a tarot profile but of course at the time she wwrote it the 13th sign was not there so I don't know how to make the tarot profile with the 13th sign in consideration. So, I am wondering if anyone has some idea's for me.