Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 9 7.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/07/2018   22:24:21   (  -0.38,-135.14) (  -0.18,-134.35)   90.48                80
 09/10/2018   10:24:46   (   0.38,-135.23) (   0.33,-135.09)   16.75                80
 09/12/2018   22:27:58   (  -0.38,-135.31) (  -0.50,-135.87)   63.43                80
 09/13/2018   22:11:54   (  -0.38,-135.35) (   0.49,-131.33)  456.78                80
 09/15/2018   10:33:43   (   0.37,-135.41) (   0.65,-136.61)  137.41                80
 09/16/2018   10:12:20   (   0.37,-135.43) (  -0.40,-132.09)  381.75                80
 09/17/2018   22:34:16   (  -0.36,-135.46) (  -0.82,-137.39)  220.49                80
 09/18/2018   22:18:13   (  -0.36,-135.49) (   0.24,-132.86)  298.99                80
 09/20/2018   10:40:02   (   0.35,-135.55) (   0.91,-138.14)  295.28                80
 09/21/2018   10:18:37   (   0.35,-135.57) (  -0.08,-133.61)  223.30                80