Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 4 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/11/2018   22:14:58   (  -0.09,-135.17) (   0.39,-132.91)  257.71                80
 04/13/2018   10:36:46   (   0.09,-135.21) (   0.78,-138.18)  339.22                80
 04/14/2018   10:20:42   (   0.09,-135.24) (  -0.23,-133.65)  180.07                80
 04/15/2018   22:42:39   (  -0.09,-135.28) (  -0.93,-138.96)  419.56                80
 04/16/2018   22:21:15   (  -0.09,-135.30) (   0.08,-134.43)   99.17                80
 04/18/2018   10:43:03   (   0.09,-135.32) (   1.08,-139.70)  499.37                80
 04/19/2018   10:26:58   (   0.09,-135.34) (   0.07,-135.17)   18.93                80
 04/21/2018   22:27:31   (  -0.10,-135.38) (  -0.21,-135.95)   64.59                80
 04/22/2018   22:11:27   (  -0.10,-135.39) (   0.80,-131.42)  453.06                80
 04/24/2018   10:30:35   (   0.10,-135.40) (   0.37,-136.69)  147.13                80