From: virker@ikke.invalid.retro.com   
      
   There is plenty of software available for visualizing and calculating   
   satellite orbits around the Earth, but I can't seem to find any software for   
   calculation - and preferably also visualization - of interplanetary   
   trajectories. I'm looking for a program not too expensive (for private,   
   educational use - preferably free :-) no more than $100), which is able to   
   e.g. simulate a trip to Mars. I can calculate a simple Hohmann-transfer   
   myself, so I'm looking for a program that is able to take into account e.g.   
   the difference in inclinations and eccentricities of the departure and   
   arrival planets, relativistic effects, etc.   
      
   The more functions, the better. For instance, if you could input the   
   spacecraft mass, fuel type and engine thrust, it should be able to calculate   
   burn durations.   
      
   /steen   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)