Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 6 27.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/28/2018   10:14:31   (  -0.08,-135.10) (  -0.73,-132.12)  339.79                80
 06/29/2018   22:33:48   (   0.11,-135.16) (  -0.39,-137.43)  258.49                80
 06/30/2018   22:17:43   (   0.09,-135.19) (   0.58,-132.89)  261.55                80
 07/02/2018   10:36:51   (  -0.12,-135.22) (   0.54,-138.17)  336.37                80
 07/03/2018   10:20:46   (  -0.11,-135.24) (  -0.44,-133.63)  183.34                80
 07/04/2018   22:40:03   (   0.13,-135.30) (  -0.68,-138.95)  415.98                80
 07/05/2018   22:23:58   (   0.12,-135.32) (   0.35,-134.42)  103.48                80
 07/07/2018   10:43:06   (  -0.15,-135.34) (   0.82,-139.68)  495.40                80
 07/08/2018   10:27:01   (  -0.14,-135.35) (  -0.21,-135.16)   23.61                80
 07/10/2018   22:27:32   (   0.15,-135.40) (   0.01,-135.92)   59.35                80