The Planets in Krynnspace

Hi everyone!  I am working on a new adventure in which the characters stop a 
person attempting a VERY complicate plan to attain immortality.  In the 
spelljammer boxed set it says that maybe the residents of Zivlyn tried to 
become a god, so I wanted info on Zivlyn.   Another thing, whatever happened 
to the planet Shinare?  It is referred to in the Dragonlance boxed set, but 
not at all mentioned in this one.