Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 6 25.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/27/2018   10:30:36   (  -0.09,-135.07) (   0.26,-136.66)  180.32                80
 06/28/2018   10:14:32   (  -0.08,-135.10) (  -0.78,-132.13)  339.97                80
 06/29/2018   22:33:48   (   0.11,-135.16) (  -0.41,-137.43)  258.54                80
 06/30/2018   22:17:44   (   0.09,-135.19) (   0.63,-132.90)  261.54                80
 07/02/2018   10:36:51   (  -0.12,-135.22) (   0.55,-138.17)  335.99                80
 07/03/2018   10:20:46   (  -0.11,-135.25) (  -0.48,-133.64)  183.77                80
 07/04/2018   22:40:03   (   0.13,-135.30) (  -0.70,-138.94)  415.73                80
 07/05/2018   22:23:58   (   0.12,-135.32) (   0.34,-134.42)  103.75                80
 07/07/2018   10:43:06   (  -0.15,-135.34) (   0.84,-139.68)  494.75                80
 07/08/2018   10:27:01   (  -0.14,-135.36) (  -0.20,-135.15)   24.15                80