Natura - nature
Ref: C. Linnaeus, 1748: 210
   actualia - actual entities
  Ref: A. Voltolini, 2006: 44 (note 19) [assumed position]
     Mundus Plinius - physical world
    Ref: C. Linnaeus, 1758: 5 [indirect position]; 24 Apr 2014.
       Astra Plinius - celestial bodies
      Ref: C. Linnaeus, 1758: 6
         Universe
        Ref: R. Powell, 2006: 13 Dec 2007 [indirect position]
           (Supercluster) Virgo-Hydra-Centaurus Supercluster
          Ref: R. Powell, 2006: 3 Nov 2010
             (Supercluster) Virgo Supercluster
            Ref: R. Powell, 2006: 3 Nov 2010
               (Cluster) Local Group
              Ref: R. Powell, 2006: 13 Dec 2007
                 (Galaxy) Milky Way Galaxy veter.
                Ref: R. Powell, 2006: 13 Dec 2007
                   (Spiral arm) Orion Arm
                  Ref: R. Powell, 2006: 13 Dec 2007
                     (Region) Local Bubble
                    Ref: Wikimedia: 5 Oct 2013
                       Local Interstellar Cloud
                      Ref: Wikimedia: 5 Jun 2013
                         (Planetary system) Solar System
                        Ref: R. Powell, 2006: 13 Dec 2007
                           (Comet) 47P/Ashbrook-Jackson (1948 Q1)
                          Ref: Minor Planet Center: 20 Sep 2013