Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 3 9.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 03/09/2018   22:33:32   (  -0.04,-135.22) (  -0.51,-137.42)  250.46                80
 03/10/2018   22:17:28   (  -0.04,-135.19) (   0.48,-132.89)  262.99                80
 03/12/2018   10:39:16   (   0.05,-135.15) (   0.69,-138.16)  342.81                80
 03/13/2018   10:17:52   (   0.04,-135.12) (  -0.30,-133.63)  170.23                80
 03/14/2018   22:39:48   (  -0.05,-135.08) (  -0.94,-138.92)  438.88                80
 03/15/2018   22:23:45   (  -0.05,-135.05) (   0.12,-134.40)   73.96                80
 03/18/2018   10:26:47   (   0.05,-134.96) (   0.12,-135.13)   20.51                80
 03/19/2018   10:05:24   (   0.05,-134.92) (  -0.94,-130.61)  491.80                80
 03/20/2018   22:27:20   (  -0.05,-134.86) (  -0.30,-135.90)  118.78                80
 03/21/2018   22:11:16   (  -0.05,-134.82) (   0.70,-131.37)  392.98                80
 03/23/2018   10:33:04   (   0.06,-134.75) (   0.47,-136.64)  215.37                80