> I have attempted to read the user defined function manual, but it 
doesn't really
 > go into much detail, or give examples of anything more than a one 
line function.

That's because functions don't support what you're trying to do. They 
only support simple mathematical expressions. You probably want to make 
a #macro instead. Then #declare will work.

#macro drawPlanet(siz, rads, ang, col)
     #declare xcord = rads * cos(ang * (pi / 180) );
     #declare zcord = rads * sin(ang * (pi / 180) );

     sphere
     {
        <xcord, 0, zcord>, siz
        texture { pigment { col } }
     }
#end


  - Slime

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