Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2013 3 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 03/11/2013   22:35:30   (   0.00,-135.37) (  -0.48,-137.59)  252.73                80
 03/12/2013   22:14:07   (   0.01,-135.36) (   0.54,-133.06)  263.01                80
 03/14/2013   10:35:56   (  -0.01,-135.41) (   0.66,-138.33)  332.64                80
 03/15/2013   10:19:53   (  -0.01,-135.41) (  -0.36,-133.80)  182.89                80
 03/16/2013   22:41:50   (   0.00,-135.34) (  -0.86,-139.10)  428.84                80
 03/17/2013   22:20:27   (   0.00,-135.33) (   0.16,-134.57)   86.25                80
 03/20/2013   10:26:12   (   0.00,-135.36) (   0.01,-135.32)    4.57                80
 03/22/2013   22:29:26   (  -0.00,-135.27) (  -0.19,-136.09)   93.90                80
 03/23/2013   22:08:03   (  -0.00,-135.25) (   0.84,-131.57)  420.42                80