Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 9 4.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/05/2018   10:18:27   (   0.39,-135.04) (   0.07,-133.56)  168.76                80
 09/06/2018   22:40:24   (  -0.38,-135.10) (  -1.24,-138.87)  430.19                80
 09/07/2018   22:24:21   (  -0.38,-135.14) (  -0.19,-134.35)   90.32                80
 09/10/2018   10:24:45   (   0.38,-135.23) (   0.34,-135.09)   16.45                80
 09/12/2018   22:27:58   (  -0.38,-135.31) (  -0.51,-135.86)   63.82                80
 09/13/2018   22:11:55   (  -0.38,-135.34) (   0.54,-131.34)  456.36                80
 09/15/2018   10:33:43   (   0.37,-135.41) (   0.67,-136.61)  137.83                80
 09/16/2018   10:12:20   (   0.37,-135.43) (  -0.39,-132.09)  381.29                80
 09/17/2018   22:34:17   (  -0.36,-135.45) (  -0.77,-137.40)  221.10                80