Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 4 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/09/2018   10:14:25   (   0.09,-135.09) (  -0.56,-132.13)  336.82                80
 04/10/2018   22:36:23   (  -0.09,-135.14) (  -0.61,-137.44)  262.05                80
 04/11/2018   22:14:58   (  -0.09,-135.17) (   0.40,-132.91)  257.46                80
 04/13/2018   10:36:47   (   0.09,-135.21) (   0.76,-138.18)  339.33                80
 04/14/2018   10:20:42   (   0.10,-135.23) (  -0.24,-133.65)  179.89                80
 04/15/2018   22:42:39   (  -0.09,-135.28) (  -0.91,-138.96)  419.96                80
 04/16/2018   22:21:15   (  -0.09,-135.30) (   0.10,-134.43)   98.72                80
 04/18/2018   10:43:03   (   0.09,-135.32) (   1.07,-139.71)  499.67                80
 04/19/2018   10:26:59   (   0.09,-135.34) (   0.07,-135.17)   18.51                80
 04/21/2018   22:27:32   (  -0.10,-135.38) (  -0.20,-135.96)   65.26                80