Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 9 26.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/28/2017   10:33:55   (   0.27,-135.45) (   0.56,-136.67)  140.09                80
 09/29/2017   10:12:30   (   0.28,-135.45) (  -0.43,-132.14)  376.26                80
 09/30/2017   22:34:27   (  -0.26,-135.39) (  -0.74,-137.45)  235.22                80
 10/01/2017   22:18:24   (  -0.26,-135.39) (   0.31,-132.92)  281.43                80
 10/03/2017   10:40:13   (   0.24,-135.45) (   0.83,-138.20)  312.95                80
 10/04/2017   10:18:49   (   0.25,-135.44) (  -0.16,-133.67)  202.88                80
 10/05/2017   22:40:45   (  -0.23,-135.37) (  -1.07,-138.96)  410.74                80
 10/06/2017   22:24:42   (  -0.24,-135.36) (  -0.01,-134.44)  105.24                80
 10/08/2017   10:43:50   (   0.22,-135.42) (   1.21,-139.71)  489.40                80
 10/09/2017   10:25:05   (   0.24,-135.40) (   0.21,-135.18)   25.64                80