Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 9 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)
 09/10/2018   10:24:45   (   0.38,-135.23) (   0.34,-135.09)   16.64                80
 09/12/2018   22:27:58   (  -0.38,-135.31) (  -0.51,-135.86)   63.56                80
 09/13/2018   22:11:55   (  -0.38,-135.34) (   0.54,-131.34)  456.64                80
 09/15/2018   10:33:43   (   0.37,-135.41) (   0.66,-136.61)  137.53                80
 09/16/2018   10:12:20   (   0.37,-135.43) (  -0.39,-132.09)  381.62                80
 09/17/2018   22:34:17   (  -0.36,-135.45) (  -0.77,-137.40)  220.70                80
 09/18/2018   22:18:12   (  -0.36,-135.48) (   0.23,-132.86)  298.76                80
 09/20/2018   10:40:02   (   0.35,-135.55) (   0.92,-138.14)  295.48                80
 09/21/2018   10:18:37   (   0.35,-135.57) (  -0.07,-133.61)  223.08                80