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) Atmosphere (Earth) - layer of air
                                   (Phenomenon) Cyclones
                                     (Event) 2004 Atlantic hurricane season
                                     (Event) 2004 Eastern Pacific hurricane season
                                     (Event) 2010/2011 South-West Indian Ocean cyclone season
                                     (Event) 2011/2012 South-West Indian Ocean cyclone season
                                     (Event) 2012 Atlantic hurricane season
                                     (Event) 2012 Eastern North Pacific hurricane season
                                     (Hurricane) Katrina (23 Aug 2005 - 30 Aug 2005)
                                     (Event) Typhoon Tip (4 Oct 1979 - 19 Oct 1979)