Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       Astra Plinius - celestial bodies
         Universe
           (Supercluster) Virgo-Hydra-Centaurus Supercluster
             (Supercluster) Virgo Supercluster
               (Cluster) Local Group
                 (Galaxy) Milky Way Galaxy veter.
                   1 (Spiral arm) Norma Arm
                   2 (Spiral arm) Scutum–Centaurus Arm
                   3 (Spiral arm) Sagittarius Arm
                   4 (Spiral arm) Orion Arm
                   5 (Spiral arm) Perseus Arm
                   6 (Spiral arm) Cygnus Arm