Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 9 24.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/25/2017   22:28:09   (  -0.28,-135.38) (  -0.42,-135.93)   63.01                80
 09/26/2017   22:12:06   (  -0.29,-135.39) (   0.63,-131.40)  454.38                80
 09/28/2017   10:33:55   (   0.27,-135.45) (   0.52,-136.68)  140.14                80
 09/29/2017   10:12:31   (   0.28,-135.45) (  -0.47,-132.15)  376.28                80
 09/30/2017   22:34:28   (  -0.26,-135.39) (  -0.70,-137.46)  235.05                80
 10/01/2017   22:18:24   (  -0.26,-135.39) (   0.29,-132.92)  281.62                80
 10/03/2017   10:40:13   (   0.24,-135.45) (   0.85,-138.20)  312.80                80
 10/04/2017   10:18:49   (   0.25,-135.45) (  -0.15,-133.67)  203.04                80
 10/05/2017   22:40:46   (  -0.23,-135.37) (  -1.02,-138.97)  410.39                80
 10/06/2017   22:24:41   (  -0.24,-135.36) (  -0.03,-134.44)  105.58                80
 10/08/2017   10:43:51   (   0.22,-135.42) (   1.17,-139.72)  489.11                80