Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 9 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/01/2018   22:34:06   (  -0.40,-134.90) (  -0.95,-137.34)  278.91                80
 09/02/2018   22:18:02   (  -0.39,-134.94) (   0.10,-132.82)  242.25                80
 09/04/2018   10:39:51   (   0.39,-135.01) (   1.10,-138.09)  351.28                80
 09/05/2018   10:18:27   (   0.39,-135.04) (   0.05,-133.57)  168.57                80
 09/06/2018   22:40:24   (  -0.38,-135.09) (  -1.22,-138.87)  431.10                80
 09/07/2018   22:24:20   (  -0.38,-135.13) (  -0.23,-134.34)   89.29                80
 09/10/2018   10:24:46   (   0.38,-135.23) (   0.32,-135.10)   15.85                80
 09/12/2018   22:27:59   (  -0.38,-135.29) (  -0.49,-135.87)   65.58                80
 09/13/2018   22:11:54   (  -0.38,-135.33) (   0.50,-131.34)  454.48                80
 09/15/2018   10:33:43   (   0.37,-135.39) (   0.64,-136.61)  139.39                80