Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 10 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)
 10/14/2018   22:28:05   (  -0.26,-135.58) (  -0.33,-135.94)   41.16                80
 10/15/2018   22:12:00   (  -0.27,-135.57) (   0.65,-131.40)  474.51                80
 10/17/2018   10:31:08   (   0.24,-135.60) (   0.48,-136.69)  123.99                80
 10/18/2018   10:12:23   (   0.25,-135.58) (  -0.51,-132.15)  390.83                80
 10/19/2018   22:34:19   (  -0.22,-135.51) (  -0.65,-137.46)  222.48                80
 10/20/2018   22:18:14   (  -0.23,-135.49) (   0.33,-132.93)  292.65                80
 10/22/2018   10:37:22   (   0.21,-135.52) (   0.79,-138.21)  305.55                80
 10/23/2018   10:21:16   (   0.22,-135.50) (  -0.19,-133.67)  208.79                80
 10/24/2018   22:40:32   (  -0.20,-135.41) (  -1.01,-138.97)  406.57                80
 10/25/2018   22:24:27   (  -0.21,-135.39) (   0.03,-134.45)  107.87                80