Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       Caelum veter. - region of the fixed stars
         (Constellation) Hydrus Bayer, 1603 - Hyi
           002545.1-771515 (Star) β Hydri
           004835.4-745524 (Star) λ Hydri
           014121.3-790854 (Star system) τ¹ Hydri
           014746.5-801036 (Star system) τ² Hydri
           015456.1-673850 (Star) η² Hydri
           015550.5-782054 (Star) σ Hydri
           015846.2-613411 (Star) α Hydri
           021414.7-675030 (Star) π¹ Hydri
           021528.5-674447 (Star) π² Hydri
           022144.9-683934 (Star) δ Hydri
           022252.3-733845 (Star) κ Hydri
           023140.5-790634 (Star) μ Hydri
           023935.4-681601 (Star) ε Hydri
           024532.6-673700 (Star) ζ Hydri
           025028.5-750401 (Star) ν Hydri
           030215.4-715409 (Star system) θ Hydri
           031557.6-772318 (Star) ι Hydri
           034714.3-741420 (Star) γ Hydri