It also mentions an interesting twist to the astrology "debate" I'd never considered:
By considering the cumulative wobbles in the dynamics of the solar system, [the authors] show that astrology has lost track of where the Earth is in relation to the other heavenly bodies. If being born at the end of July made you a Leo 2,000 years ago, it should make you a Cancer today. But the astrological charts have not changed in that time.
Not that actual science will have any effect on the true believers, but I'd never heard that point mentioned before. I don't know enough cosmology to confirm it but it certainly makes sense.