Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 4 7.  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) (   0.43,-136.67)  183.06                80
 04/09/2018   10:14:26   (   0.09,-135.09) (  -0.58,-132.14)  336.80                80
 04/10/2018   22:36:23   (  -0.09,-135.14) (  -0.59,-137.45)  262.16                80
 04/11/2018   22:14:59   (  -0.09,-135.17) (   0.42,-132.92)  257.34                80
 04/13/2018   10:36:47   (   0.09,-135.21) (   0.75,-138.19)  339.37                80
 04/14/2018   10:20:42   (   0.10,-135.23) (  -0.26,-133.66)  179.83                80
 04/15/2018   22:42:40   (  -0.09,-135.28) (  -0.89,-138.97)  420.12                80
 04/16/2018   22:21:15   (  -0.09,-135.30) (   0.12,-134.44)   98.59                80
 04/18/2018   10:43:03   (   0.09,-135.32) (   1.05,-139.71)  499.74                80
 04/19/2018   10:26:59   (   0.09,-135.34) (   0.04,-135.18)   18.48                80