Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 5 12.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/12/2018   22:33:49   (  -0.08,-135.45) (  -0.54,-137.46)  229.77                80
 05/13/2018   22:17:44   (  -0.08,-135.43) (   0.48,-132.93)  285.50                80
 05/15/2018   10:36:53   (   0.07,-135.38) (   0.69,-138.20)  321.11                80
 05/16/2018   10:20:48   (   0.07,-135.36) (  -0.33,-133.67)  193.56                80
 05/17/2018   22:40:05   (  -0.06,-135.36) (  -0.85,-138.97)  411.29                80
 05/18/2018   22:23:59   (  -0.06,-135.34) (   0.11,-134.43)  102.99                80
 05/21/2018   10:27:03   (   0.06,-135.25) (   0.03,-135.17)    8.92                80
 05/23/2018   22:27:34   (  -0.06,-135.21) (  -0.25,-135.93)   83.04                80
 05/24/2018   22:11:29   (  -0.06,-135.19) (   0.77,-131.40)  430.82                80
 05/26/2018   10:30:38   (   0.05,-135.12) (   0.39,-136.68)  177.90                80