From: someguy@somewhere.se.retro.com   
      
   Steen wrote:   
   > Tonight, an Atlas 5 is going to launch an Inmarsat satellite. The launch   
   > window opens at 2142 UTC and closes 15 minutes later.   
   >   
   > -why? Why is there a launch window when launching to GEO? Couldn't a   
   > satellite destined for GEO be launched at any time?   
   >   
   > /steen   
   >   
   >   
   In principle yes, but as you want to be in sunlight when executing   
   critical spacecraft operations, using for instance simple sun sensors,   
   the mission planning calls for a certain launch window   
      
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