Begin with initial event of Joe at Earth and Red Flagship.  Place origin
  of time and space at this event.

          Earth:   x0  =  0        t0  =  0                     Jan 1, 2500

          Joe:     x0' =  0        t0' =  0                     Jan 1, 2500




  Q:  According to people on planet P1
      (or on the Earth, or on any planet),
      what is the time and location 
      of this event?


          x1  =  1 yr

                 1 yr - 0 yr     1 yr
          t1  =  -----------  =  ----   =   1.11 yr              Feb 9, 2501
                   0.9 c         0.9
          


  Q:  According the Joe, 
      what is the time and location 
      of this event?

        x1'        =  gamma * ( x1  -  v * t1 ) 

                   =  2.294 * ( 1   -  0.9 * 1.11 ) 

        --->  x1'  =    0.0   yr


        
        t1'        =  gamma * ( t1  -  v * x1 )

                   =  2.294 * ( 1.11 - 0.9*1 )

                   =  0.484                                      Jun 25, 2500