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.
                   (Spiral arm) Orion Arm
                     (Region) Local Bubble
                       Local Interstellar Cloud
                         (Planetary system) Solar System
                           (Planet-satellite system) Earth System
                             (Planet) Earth veter.
                               "spheres" (Earth)
                                 (Sphere) Biosphere (Earth) - zone of life
                                   "geopolitical regions"
                                     (Region) World
                                       (Region) Old World
                                         [(Empire) ‡Byzantine Empire (330-1453)]
                                         [(Empire) ‡Ottoman Empire (1299-1923)]
                                         [(Empire) ‡Roman Empire (27 BC - 476 AD)]
                                         1 (Region) Eurasia
                                         2 (Region) Mediterranean (Afro-Eurasia)
                                         3 (Region) Africa