Therefore the light from stars is a plane wave, that at any frequency   
   is of the form A Exp[i(omega t - kx + phi(t)) + theta(t)] ?   
   That is light is spatially but not temporally coherent?   
      
   Thus my question is at which extent such light is temporally coherent?   
   Or how it is possible to make interferometry with light from stars?   
   Is that related to some coherence time for light ?   
      
   [[Mod. note -- This has mostly been answered by other posts in this   
   thread.  -- jt]]   
      
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