 Only a minority of these have proper names.Many of the proper names that remain in use in modern astronomy are based on Arabic star names from medieval Islamic astronomy, which in turn was substantially based on Claudius Ptolemy’s "Almagest", which contained the original Greek and Latin names for stars.For example, the Arabs translated "Opisthen" (Οπισθεν "after" or "following") or "Opiso" (Οπισω "to follow after"), one of the original Greek names for the brightest star in Taurus, as "Aldebaran" (الدبران), which means "the Follower" in Arabic, because the star always follows behind the Pleiades as both move across the sky.