Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 6 29.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/29/2018   22:33:48   (   0.11,-135.16) (  -0.41,-137.43)  258.31                80
 06/30/2018   22:17:43   (   0.09,-135.19) (   0.62,-132.90)  261.69                80
 07/02/2018   10:36:51   (  -0.12,-135.22) (   0.55,-138.17)  336.53                80
 07/03/2018   10:20:46   (  -0.11,-135.24) (  -0.48,-133.64)  183.14                80
 07/04/2018   22:40:03   (   0.13,-135.30) (  -0.70,-138.94)  415.92                80
 07/05/2018   22:23:58   (   0.12,-135.32) (   0.34,-134.41)  103.49                80
 07/07/2018   10:43:05   (  -0.15,-135.33) (   0.84,-139.68)  495.64                80
 07/08/2018   10:27:01   (  -0.14,-135.35) (  -0.20,-135.15)   23.21                80
 07/10/2018   22:27:33   (   0.15,-135.40) (   0.06,-135.93)   59.36                80
 07/11/2018   22:11:27   (   0.14,-135.41) (   1.04,-131.39)  458.74                80
 07/13/2018   10:30:35   (  -0.17,-135.41) (   0.13,-136.65)  142.33                80