There are numerous things wrong with astrology.
- At its vaguest, it is unfalsifiable by making general statements that can apply to anyone. (I.e., this aspect is unfalsifiable.)
- At its most precise, it should have been able to predict the discovery of planets such as Neptune, Uranus, Pluto, and maybe even asteroids (Ceres) and Kuiper Belt Objects (Quaoar, Sedna, Xena/2003UB13). Astrologers failed to do so, and therefore have failed the one objective test that we could administer. (I.e., this aspect has been falsified.)
- Precession - a wobbling effect of the Earth's axis - means that you weren't actually born in your birth sign, but the one after. The "first point in Aries" (vernal equinox, first day of Spring) actually is in Pisces, and it's nearly the "Age of Aquarius."
- They left out Ophiuchus. There's actually 13 zodiacal constellations, and it's the extra.
Now that you've listened to me rant about it, listen to someone else rant, and then try very hard not to mock ID proponents.