Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 4 6.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/08/2018   10:30:30   (   0.09,-135.06) (   0.47,-136.66)  182.93                80
 04/09/2018   10:14:26   (   0.09,-135.09) (  -0.60,-132.14)  337.00                80
 04/10/2018   22:36:22   (  -0.09,-135.14) (  -0.62,-137.44)  262.02                80
 04/11/2018   22:14:58   (  -0.09,-135.17) (   0.39,-132.91)  257.56                80
 04/13/2018   10:36:46   (   0.09,-135.21) (   0.78,-138.18)  338.96                80
 04/14/2018   10:20:42   (   0.10,-135.24) (  -0.23,-133.65)  180.33                80
 04/15/2018   22:42:39   (  -0.09,-135.28) (  -0.92,-138.96)  419.67                80
 04/16/2018   22:21:15   (  -0.09,-135.30) (   0.09,-134.43)   99.08                80
 04/18/2018   10:43:03   (   0.09,-135.33) (   1.08,-139.70)  499.02                80
 04/19/2018   10:26:58   (   0.09,-135.34) (   0.07,-135.17)   19.24                80