Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       Caelum veter. - region of the fixed stars
         (Constellation) Crux Royer, 1679 - Cru
           (Star system) α Crucis - Acrux
             1 (Star system) α¹ Crucis - Acrux
             2 (Star system) α² Crucis