Aldebaran (Alpha Tauri) is the brightest star in the constellation Taurus. Aldebaran is a star of the spectral type K5 (orange). It is 65 light years from the Sol system. It is one of the brightest nighttime winter stars. Aldebaran has been called "The Bull's Eye" in the past, because it forms the eye of the bull. Aldebaran is derived from the Arabic al-dabaran, meaning "the follower", which refers to how it follows the Pleiades across the sky at night. In Medieval astrology, Aldebaran was considered to predict honors and riches, being called "the fortunate star".