Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 9 26.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/28/2018   22:28:08   (  -0.33,-135.60) (  -0.39,-135.89)   33.32                80
 09/29/2018   22:12:03   (  -0.34,-135.61) (   0.61,-131.36)  484.24                80
 10/01/2018   10:33:52   (   0.32,-135.65) (   0.53,-136.64)  112.54                80
 10/02/2018   10:12:28   (   0.32,-135.65) (  -0.47,-132.11)  403.78                80
 10/03/2018   22:34:25   (  -0.30,-135.61) (  -0.69,-137.42)  205.42                80
 10/04/2018   22:18:21   (  -0.31,-135.61) (   0.31,-132.88)  311.21                80
 10/06/2018   10:40:10   (   0.28,-135.65) (   0.82,-138.16)  285.53                80
 10/07/2018   10:18:46   (   0.30,-135.64) (  -0.18,-133.63)  230.44                80
 10/08/2018   22:40:42   (  -0.27,-135.59) (  -1.03,-138.93)  380.47                80
 10/09/2018   22:24:37   (  -0.28,-135.59) (  -0.03,-134.39)  135.92                80