Etymologically, the word astrology comes to us from the Greeks and has two parts: astro and logos. Logos means “a branch of study” and astro means “stars,” so astrology literally means the study of the stars, much as biology is the study of life. Studying the stars may sound like a misnomer however, since most astrologers focus on planets such as Mars, Mercury, and Uranus, not stars like Sirius or Betelgeuse. Why not call it planetology?