Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 9 29.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/30/2017   22:34:27   (  -0.26,-135.39) (  -0.72,-137.46)  235.61                80
 10/01/2017   22:18:22   (  -0.26,-135.39) (   0.29,-132.93)  280.89                80
 10/03/2017   10:40:11   (   0.24,-135.45) (   0.87,-138.21)  313.94                80
 10/04/2017   10:18:46   (   0.25,-135.45) (  -0.15,-133.68)  201.70                80
 10/05/2017   22:40:43   (  -0.23,-135.37) (  -1.04,-138.98)  412.23                80
 10/06/2017   22:24:38   (  -0.24,-135.36) (  -0.03,-134.46)  103.58                80
 10/08/2017   10:43:46   (   0.22,-135.42) (   1.18,-139.74)  491.47                80
 10/09/2017   10:27:42   (   0.23,-135.41) (   0.16,-135.21)   23.42                80
 10/11/2017   22:28:13   (  -0.22,-135.29) (  -0.39,-135.97)   78.65                80
 10/12/2017   22:12:08   (  -0.23,-135.27) (   0.63,-131.45)  435.96                80