I always considered myself a pretty balanced person. I was just like a Libra, and each time I read my horoscope (which wasn't too often), I found that it was pretty accurate. That accuracy doesn't matter anymore, though, because I am now considered a Virgo according to NASA.
In the words of NASA, "The Babylonians ignored the fact that the sun actually moves through 13 constellations, not 12. Then they assigned each of those 12 constellations equal amounts of time." They picked Ophiuchus to leave out 3,000 years ago when the Babylonians were designing the 12 month calendar. Since it worked out being 12 months, they decided to have 12 zodiac signs, because why wouldn't they want them to match up?
No need to worry, though! Ophiuchuses are just as cool as the other signs. According to ZodiacBooks.com, "House Ophiuchus represented Unity. Its people were spirited, magnetic, impulsive, clever, flamboyant, and at times jealous, power-hungry, and temperamental. At their hearts, they were healers who hoped to one day rid the Zodiac of every ill — disease, violence, etc. — and bring everyone closer together.”
Whether or not you believe in horoscopes, there is a probability that yours has changed thanks to the inclusion of Ophiuchus!