When was the last time you needed to use a planet in its
adjectival form but couldn't remember or didn't know it? I'm
sure it happens to all of us. So, for referential purposes
and to save untold future embarrassment, here they are:

   Noun        Adjectival form
   ------      ---------------
   Sun         Solar
   Mercury     Mercurial
   Venus       Cytherean, Venerian
   Earth       Terrestrial, Telluric
   Moon        Lunar
   Mars        Martian, Arean
   Jupiter     Jovian, Jovial
   Saturn      Saturnian
   Uranus      Uranian
   Neptune     Neptunian
   Pluto       Plutonian, Hadean

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