Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       Caelum veter. - region of the fixed stars
         (Constellation) Pegasus veter. - Peg
           (Planetary system) 51 Pegasi
             1 (Star) 51 Pegasi
             2 (Planet) 51 Pegasi b - "Bellerophon"