Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 9 30.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 10/01/2017   22:18:23   (  -0.26,-135.39) (   0.31,-132.93)  281.09                80
 10/03/2017   10:40:11   (   0.24,-135.45) (   0.85,-138.21)  313.83                80
 10/04/2017   10:18:47   (   0.25,-135.45) (  -0.17,-133.68)  201.85                80
 10/05/2017   22:40:43   (  -0.23,-135.37) (  -1.03,-138.99)  411.98                80
 10/06/2017   22:24:38   (  -0.24,-135.36) (  -0.01,-134.46)  103.89                80
 10/08/2017   10:43:47   (   0.22,-135.42) (   1.17,-139.74)  491.26                80
 10/09/2017   10:25:01   (   0.24,-135.41) (   0.22,-135.20)   23.64                80
 10/11/2017   22:28:13   (  -0.22,-135.29) (  -0.40,-135.97)   78.37                80
 10/12/2017   22:12:09   (  -0.23,-135.28) (   0.62,-131.45)  436.26                80
 10/14/2017   10:31:17   (   0.21,-135.32) (   0.54,-136.72)  160.10                80