• Both astrology and astronomy are in the business of making predictions. For much of the 17th or 18th century, astronomy and astrology went hand in hand.

  • Astronomy makes predictions about events such as the motion of planets and the expansion of galaxies. Astronomers explain their predictions with such features as masses, distances and gravitational forces.

  • Astrology can be useful for self-reflection. It asks us whether we have traits that are specific to our astrological signs, and whether those we like have the traits that theory suggests they should have.