Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 7 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 07/14/2018   10:14:30   (  -0.16,-135.44) (  -0.89,-132.12)  378.51                80
 07/15/2018   22:33:47   (   0.19,-135.49) (  -0.23,-137.44)  221.58                80
 07/16/2018   22:17:42   (   0.17,-135.50) (   0.75,-132.89)  296.52                80
 07/18/2018   10:36:49   (  -0.20,-135.49) (   0.42,-138.16)  305.52                80
 07/19/2018   10:20:45   (  -0.19,-135.49) (  -0.62,-133.63)  212.34                80
 07/20/2018   22:40:01   (   0.22,-135.53) (  -0.56,-138.94)  388.46                80
 07/21/2018   22:23:56   (   0.21,-135.54) (   0.48,-134.41)  129.12                80
 07/23/2018   10:43:04   (  -0.24,-135.52) (   0.68,-139.68)  473.75                80
 07/24/2018   10:26:58   (  -0.23,-135.52) (  -0.30,-135.14)   43.37                80
 07/26/2018   22:27:30   (   0.24,-135.55) (   0.16,-135.91)   41.77                80